Class 8 Nso 5 Year

ebook NATIONAL SCIENCE OLYMPIAD

5

Years (2014-2018) Solved Papers

INSTANT

CLASS

8

Copyright © 2019 Science Olympiad Foundation. Printed with the permission of Science Olympiad Foundation. No part

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CLASS 8

Contents ÂÂ NSO 2014 - SET A ÂÂ NSO 2014 - SET B ÂÂ NSO 2015 - SET 1 ÂÂ NSO 2015 - SET 2 ÂÂ NSO 2016 - SET A ÂÂ NSO 2016 - SET B ÂÂ NSO 2017 - SET A ÂÂ NSO 2017 - SET B ÂÂ NSO 2018 - SET A ÂÂ NSO 2018 - SET B

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For Classes 6, 7, 8, 9, 10, 11 & 12 Class 6

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Class 8

Set A Year 2014

17th NSO - SET A

2

Logical reasoning 1.

Select the option which will replace the question mark in the given number series. A. C.

2.

4.

If the alphabets are written in the reverse order after interchanging alphabets from ‘D to L’ with those from ‘R to Z’ respectively, which letter would be midway between W and E in the new order? A. C.

7.

Grandson Granddaughter Great grandson None of these

Z D

B. D.

N None of these

If Fig. (X) is rotated one step in a particular direction, then identify its rotated form, from the given option figures.

Fig. (X)

At a dinner party, both fish and meat were served. Some took only fish while some took only meat. There were some vegetarians also who did not accept either of the two, while the rest accepted both fish and meat. Which of the following Venn diagrams correctly represents this situation? A.

B.

C.

D.

8.

A.

B.

C.

D.

Select a figure from the given options which will complete the given figure matrix.

Six people P, Q, R, S, T and U are sitting on the ground in a hexagonal shape. All the sides of the hexagon, so formed, are of same length. P is not adjacent to Q or R; S is not adjacent to R or T; Q and R are adjacent; U is in the middle of S and R. Who is at the same distance from S as T is from S? A. B. C. D.

5.

10, 100, 200, 310, ? B. 410 D. 430

Mr. ‘X’ shows three photographs to Mr. 'Y'. Pointing towards photograph 1, he says, “The person in photograph 1 is my uncle, who says ‘uncle’ to the person in photograph 2, and the person in photograph 3 is called ‘uncle’ by the person in photograph 2.” How is Mr. ‘X’ related to the person in photograph 2? A. B. C. D.

3.

400 420

6.

Q R U Can't be determined

Select the pair of figures which satisfies the same conditions of placement of dots. 9.

A. C.

I, II III, IV

B. D.

II, III I, IV

A.

B.

C.

D.

Three of the following four numbers are alike in a certain way and so form a group. Which of the following does not belong to that group? A. C.

143 759

B. D.

399 257

17th NSO - SET A

3

10. There are seven figures, the first and last of which are unmarked and remaining are marked as P, Q, R, S and T. However, the series will be established only if the positions of two of the marked figures are interchanged. Find the figures.



A. C.

PQ QT

B. D.

A.

14



B.

15



C.

16



D.

12

What will come in place of (b)?



A. C.

21 19.5

B. D.

23.5 16

13. There are five different successive figures showing movement of the hands in a clock. Identify the pattern and find the next figure.

QR ST

11. A pile of cubes of equal size is arranged in the form of a block as shown in the figure. If the block is dipped into a bucket filled with red paint, so that only the surfaces of the block get coloured, then how many cubes are coloured on three faces only?





A.



B.



C.



D.

14. In a code language, each of the vowels, i.e., A, E, I, O and U, is substituted by the letter preceding it, while a consonant is substituted by the nearest vowel. How can the word EVIDENCE be written in that code?

12. Two series in two rows are given below. In the first row, a full series is given which follows a specific pattern. The second row has a series, similar to the first series but only first element of this series is given, followed by (a), (b), (c), (d) and (e), representing the subsequent elements. Complete the series and answer the question that follows : 7 24 10 33 14.5 46.5 11 (a) (b) (c) (d) (e)



A. B. C. D.

DUHJEDOED DUHEDUAD DUJEDOAD DUHEDOAD OR DUHEDOED

15. At my farmhouse I am facing East, then I turn left and walk 10 metres. I again turn right and walk 5 metres. Again I go 5 metres towards the South, and from there walk 5 metres towards the West. In which direction am I from my farmhouse ?

A. C.

East North

B. D.

West South

Science 16. When a constant force acts on a mass, and the mass starts moving from rest, then the



(i) acceleration is constant (ii) velocity increases at a constant rate (iii) distance travelled is directly proportional to the time. Which of the above statements is/are correct? A. (i) only B. (i) and (ii) only C. (i) and (iii) only D. (ii) and (iii) only

17. Which planet is called the morning star as well as the evening star, depending on its position with respect to the sun? A. Mercury B. Venus C. Mars D. Saturn

s

18. The displacement-time graph of a body in motion is shown here. The corresponding velocity-time graph will be v



A.

v t



t

B.

v

v



D.

C.

t

t

t



17th NSO - SET A

4

19. A man standing in front of a large wall, claps two objects against each other at an interval of 1.2 s regularly. The echo of the first clap coincides with the fifth clap. If the speed of sound in air is 340 m s–1, the distance between the man and the wall is ____. A. C.

408 m 816 m

B. D.

1632 m 204 m

20. The image formed by the side-view mirror of an automobile is (i) of the same size as that of object (ii) virtual and diminished (iii) erect and real (iv) erect and magnified. Which of the following statements is/are correct? A. (i) only B. (ii) only C. (i) and (iii) only D. (iii) and (iv) only 21. The diagram shows a man standing at a position M in front of a plane mirror, a distance of x m from the mirror.

A. B. C. D.

25. A cube of side 0.2 m rests on the floor, as shown. Given that the cube has a mass of 50 kg, the pressure exerted by the cube on the floor is ________. (Take g = 10 N kg–1) A. 25 N m–2 C. 1250 N m–2

A. B.

D.

22. A substance in gaseous form is being cooled to solid state. Its temperature will remain constant when the substance is (i) in condensing phase (ii) in freezing phase (iii) at thermal equilibrium with the environment. A. (i) only B. (iii) only C. (i) and (ii) only D. (i), (ii) and (iii) 23. During a track and field meet, the time difference between seeing the smoke from a starter's gun and hearing the bang would be less ______. A. B. C. D.

On a warmer day On a cooler day If a more powerful shell were used If a less powerful shell were used

24. Read the given statements and mark the correct option. Statement -1 : A convex mirror always forms a real image. Statement -2 : A diverging beam incident on a convex mirror is reflected as a diverging beam.

B. D.

50 kg 0.2 m

250 N m–2 12500 N m–2

26. In an electrical circuit containing a battery, the positive charge inside the battery ________.

C.

When the man moves 3 m away from the mirror, the new distance between the man and his image becomes 12 m. What is the value of x? A. 1 m B. 2 m C. 3 m D. 4 m

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. Statement 1 is false but statement 2 is true. Both statements 1 and 2 are false.

always goes from positive terminal to the negative terminal may go from positive terminal to negative terminal always goes from the negative terminal to positive terminal does not move

27. A plank is supported on the steps of a staircase as shown in the figure. How many forces are acting on the plank? A. B. C. D.

4 5 6 7

Plank

28. How do cyclones decrease the fertility of soil in the coastal areas? A. B. C. D.

By By By By

flooding the land with saline water. dissolving soil and rocks. increasing the water table of the place. decreasing the water table of the place.

29. Read the given statements and select the correct option. Statement-1 : Petroleum is called ‘black gold’. Statement-2 : Petroleum is a dark oily liquid. A. Both statements 1 and 2 are true but statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Both statements 1 and 2 are false.

17th NSO - SET A

5

30. Read the table carefully. S. Reaction No. 1. Copper vessel exposed to moist air. 2. Aluminium foil dipped in fresh solution of sodium hydroxide. 3. Rusting of iron.

33. Identify V, W, X, Y and Z in the given Venn diagram. Product formed Green coating

Characteristic test Turns red litmus solution blue. Colourless, Burns with a odourless pop sound. gas

Reddish brown deposit 4. Burning of sulphur Colourless, powder. suffocating gas

Identify the products formed and A. (1) Cu(OH)2 , CuCO3; basic (3) Fe2O3; basic B. (1) CuO; basic (3) Fe3O4; basic C. (1) Cu(OH)2 , CuCO3; basic (3) Fe2O3; acidic D. (1) Cu; basic (3) FeO, basic

Turns red litmus solution blue. Turns blue litmus solution red.

their (2) (4) (2) (4) (2) (4) (2) (4)

nature. H2; neutral SO2; acidic O2; neutral H2S; acidic H2; neutral SO2; basic H2O; neutral SO3; basic

31. Which of the following examples are periodic changes? I. Occurrence of eclipse. II. The flowering of jasmine bush. III. Occurrence of new moon. IV. Opening and closing of stomata. V. Appearance of rainbow. VI. Rotation of earth. VII. Blinking of eyes. VIII. Twinkling of stars. A. I, V, VII and VIII B. I, II, III and IV C. II, III, IV and VI D. All are non-periodic changes. 32. Neha, a class VIII student arranged the following experimental set-up and observed the changes carefully.



On the basis of her observations identify the correct order of reactivity. A. Zn > Cu > Fe B. Zn > Fe > Cu C. Fe > Zn > Cu D. Cu > Fe > Zn

V A. Filling

W Withdrawing money from ATM Charging mobile battery Charging mobile battery Filling a water bottle

a water bottle B. Filling a water bottle C. Burning a candle

D. Boiling an egg

X

Y

Burning a candle

Charging mobile battery Withdrawing money from ATM Boiling an egg

Burning a candle

Filling a water bottle Withdrawing Charging money from mobile ATM battery

Z Boiling an egg Boiling an egg Withdrawing money from ATM Burning a candle

34. Different mixtures are taken in four different test tubes and each of them is tested with indicators as shown below : Methyl orange

Turmeric solution

5 mL Sour milk + 5 mL Water

Pinch of baking powder + 5 mL Lime water

(1)



(2)

(3)

Phenolphthalein

China rose

Pinch of salt + 5 mL Sugar

5 mL Lemon juice + 5 mL Tamarind juice (4)

Select the incorrect observation. A. No change in colour in test tubes 1 and 3. B. Turmeric solution turns red in test tube 2. C. China rose turns magenta in test tube 4. D. None of the above

35. Match the articles given in Column-I with the fibres/plastics from which they are made in Column-II. (a) (b) (c) (d) (e) A. B. C. D.

Column-I Column-II Toothbrush bristles (i) Melamine Carpet (ii) PVC Bottle (iii) Nylon Toy (iv) Rayon Fire resistant fabric (v) PET (a)-(i), (b)-(iv), (c)-(ii), (d)-(v), (e)-(iii) (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i), (e)-(v) (a)-(iii), (b)-(iv), (c)-(v), (d)-(ii), (e)-(i) (a)-(iii), (b)-(v), (c)-(iv), (d)-(i), (e)-(ii)

17th NSO - SET A

36. The manufacture of bread, beer and wine involves alcoholic fermentation of glucose to ethanol by yeast. Which of the following five statements concerning this process are correct? I. Yeast carries out fermentation because yeast cells lack mitochondria. II. For every molecule of ethanol produced, one molecule of CO2 evolves. III. For every one molecule of glucose fermented, net two molecules of ATP are generated. IV. More than 80% of the chemical energy of the glucose is released as heat. V. Glycolysis is an integral part of this fermentation. A. II, III and IV B. I, II, III and V C. II, III and V D. I, IV and V 37. Thyroxine controls _______ in frogs and the development of _______ and ______ during embryonic development of other vertebrates. Thyroxine production requires the presence of ______ in diet. Select the correct sequence of words to complete the above passage. A. Development, Circulatory system, Muscles, Iodine B. Metamorphosis, Circulatory system, Muscles, Calcium C. Development, Bones, Nervous system, Iron D. Metamorphosis, Bones, Nervous system, Iodine 38. The given pie charts show the composition of three types of soil samples X, Y and Z. Which of the following is correct regarding these soil samples?

6

40. The names of some plants are given below in the list : I. Lady’s finger VI. Grass II. Drumstick VII. Xanthium III. Balsam VIII. Madar IV. Urena IX. Sunflower V. Maple X. Coconut Match these plants with the mode of dispersal of their fruits/seeds and select the correct option.

A. B. C. D.

Wind

Animals

II, V, VI, VIII, IX

III, IV, VII

X

I

II, V, VI, VIII, IX

IV, VII

X

I, III

V, VI, IX

II, IV, VII

X

I, III, VIII

II, VI, VII, VIII

I, IX

X

III, IV, V

Some steps involved in the treatment of water in a wastewater treatment plant are labelled as P, Q, R and S in the above diagram. The table given below shows () for those steps in which the particular process is occurring while () for those in which it is not occurring. Which among these is/are incorrect? I.

P Q R S

Sludge removal

   

II. Anaerobic decomposition X is unable to hold water or nutrients. Y is used for pot making. Z provides good aeration to plant roots. X is best suited for cultivation.

39. Read the given statements and select the correct option. Statement-1 : Chloroplast and mitochondria are semi-autonomous organelles. Statement-2 : Chloroplast and mitochondria have their own DNA and protein synthesizing machinery. A. B. C. D.

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement  1. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. Statement 1 is true and statement 2 is false. Both statements 1 and 2 are false.

Bursting of fruits

41.

Process

A. B. C. D.

Water

   

III. Cleaning of clarified watery waste     IV. Disinfection of treated water A. C.

I and II II only

B. D.

    III and IV None of these

42. According to the extent of threat to a species and its population in its natural habitat, four categories have been identified which are given below : I. Extinct in wild II. Critically endangered species III. Vulnerable species IV. Endangered species Select the correct order of these species according to their conservation priority? A. II > IV > I > III B. I > II > IV > III D. I > IV > III > II C. III > I > II > IV

17th NSO - SET A

7

43. Refer to the given figures of bacteria (X, Y and Z) and read the statements I, II & III regarding these. Based on the given information, identify the bacterium and select the correct option.



I. II.

Bacteria X causes cholera. Bacteria Y causes a disease which disrupts proper exchange of gases. III. Bacteria Z converts lactose sugar of milk to lactic acid. A. X is Vibro cholerae. B. Z is Lactobacillus. C. Y is Salmonella typhi. D. Both A and B 44. Following investigation was carried out using flower buds growing on three plants of the same species. Plant X → The anthers were carefully removed, and the buds left open to the air. Plant Y → The anthers were left untouched, and a paper bag was tied tightly around each bud.



Plant Z → The anthers were carefully removed, and a paper bag was tied tightly around each bud.



Although all flowers later bloomed normally, only those on plant X, produced seeds. This result showed that in this species _____ pollination can take place.



A. C.

Only insect Only wind

B. D.

Only cross Either of A, B or C

45. Match Column I with Column II and select the correct option from the codes given below. Column I Column II (i) Poisoning of bald eagles (a) SPM (b) Typhoid (ii) Green house gas (c) CO (iii) Vehicle exhaust (d) CO2 (iv) Incomplete combustion (e) DDT (v) Pathogens in polluted water a b c d e A. iii v ii iv i B. i iii iv ii v C. iii iv v ii i D. iii v iv ii i

ACHIEVERS SECTION 46.



The given graph shows two crop fields (X and Y ) that have been treated by different types of materials for nutrient replenishment, keeping other environmental factors same. Given are some assumptions regarding the crop fields and the materials used. Select the most correct one(s).





I.

Addition of chemical fertilizers in Y has resulted in sudden increase in yield due to increased release of N, P, K nutrients, but it gradually declined as continuous use of chemicals killed useful microbes that replenish the soil fertility. II. The difference in the two graphs indicates that the crop fields X and Y are treated with fertilizer and manure respectively, as fertilizer is beneficial for long time and gives durable yield whereas manure gives immediate yield but later causes problems. III. The highest peak in crop field X is slightly delayed because manure enriches soil fertility gradually.

A. C.

I and II III only

B. D.

II only I and III

47. A large number of functions are performed by different hormones secreted by endocrine glands. Match the given functions (a, b, c, d and e) to the labelled glands in the figure and select the correct option.

a.

Maintains a steady level of glucose in the blood. b. Helps in the growth of human body and also sends signals to other organs to secrete hormones. c. Controls secondary sexual characters and maintains pregnancy. d. Controls rate at which food is oxidised by the cells to produce energy. e. Increases blood pressure and heart rate, when the body experiences stress. a b c d e A. R P Q T S B. P R Q S T C. S P Q R T D. R P Q S T

17th NSO - SET A

8

Direction (Q.No. 48 and 49): Refer to the given passage and answer the following questions:

50. Sakshi performed two experiments as shown in figure 1 and 2, and recorded her observations in the table.

Ram jogs from one end X to the other end Y of a straight 300 m road in 2 minutes 30 seconds, and then turns around and jogs 100 m back to point Z in another 1 minute. X

300 m

Z

Y 100 m

48. What is Ram’s average speed and average velocity while jogging from X to Y respectively? A.

1.0 m s–1 , 1.0 m s–1

B.

3.0 m s–1, 2.0 m s–1

C.

2.0 m s–1, 2.0 m s–1

D.

4.0 m s–1, 1.0 m s–1

49. What is Ram’s average speed and average velocity while jogging from X to Z respectively ? A.

2.0 m s–1, 1.9 m s–1

B.

5.1 m s–1, 9.1 m s–1

C.

1.0 m s–1, 1.0 m s–1

D.

1.9 m s–1, 0.9 m s–1

Observation

Does paper pan burn?

Is ignition temperature of paper reached? Figure 1 Figure 2 Figure 1 Figure 2

I Yes Yes No Yes II Yes No Yes No III No Yes Yes Yes Find out the correct observation and the reason behind it from the options given below. A. I, paper has a higher ignition temperature than water. B. II, fireproof paper pan is used in figure 2. C. III, paper is non-inflammable. D. II, heat supplied to the paper pan is transferred to water by conduction, so ignition temperature of paper is not reached in figure 2.

SPACE FOR ROUGH WORK

Class 8

Set B Year 2014

17th NSO - SET B

2

Logical reasoning 1.

Select a figure from the options in which Fig. (X) is exactly embedded as one of its part.

5.

If in a code REQUEST is written as S2R52TU, then how will ACID be written in that code? A. B. C. D.

A.

Three positions of a dice are shown below. What is the number opposite to the number 1 ? 6 3

3.

4.

A.

2

B.

3

C.

5

D.

6

4

1 5

5

4

8 is related to 81 in the same way as 64 is related to ________. A. B. C. D.

D.

C.

2.

6.

B.

6

4

BDJE 1394 B3J4 1D3E

125 137 525 625

7.

Select a figure from the options which will continue the given series. 11 1 11 1 1 ? 3 8 4 8 6 6 A. 6

Vijay walks 10 kilometres towards North. From there, he walks 6 kilometres towards South. Then, he walks 3 kilometres towards East. How far and in which direction is he now with reference to his starting point?

C. 8.

B.

5

4

7

6



4

D.

Study the series carefully and answer the question that follows.

A.

5 kilometres West

B.

5 kilometres North-East

∂ = b F 2 * K S 7 5 # $ PLV 8 @ M 6 ↑ Q G © 9 3 &TY£ What will come in place of question mark?

C.

7 kilometres East

If '= → 2', 'K → #' and 'P → M', then '↑ → ?'.

D.

7 kilometres West

A. B. C. D.

Find the mirror image of the Fig. (X), if the mirror is placed vertically to the left. 9. Fig. (X)

A.

B.

3 T 9 &

In first row, a series is given which follows a specific pattern. The second row has a series, similar to the first series but only first element of this series is given. Identify the pattern and answer the question that follows. 6 2

C.

D.

18 a

36 b

108 c

What will come in place of e ?

216 648 d e

17th NSO - SET B



A. B. C. D.

3

482 344 216 420

13. Select a pair of figures which satisfies the same conditions of placement of dots.

10. In the given Venn diagram, find the region representing persons who are educated and employed but not confirmed in job. Employed

Educated

b

a



A. B. C. D.

d

e

c

Confirmed in job

A.



B.



C.



D.



A. B. C. D.

R

S

PR QS PS QT

d e b a, b

Fig. (X)





A.



C.



B.





D.

15. A sheet of paper is folded in a particular manner and a punch is made. Select a figure from the options which will closely resemble the unfolded form of given sheet.

?

12. A is the brother of B. C is married to D. If C is the nephew of B, how is A related to D?



A.



B.





C.



D.

A. B. C. D.

T

14. Which of the following options will exactly make up the key Fig. (X) ?

11. Which of the following figures will complete the figure matrix ?

Q

P

Father-in-law Mother-in-law Son-in-law Daughter-in-law

Science 16. The pressure of the water near the bottom of the wall forming a dam does not depend on ______.

A. B. C. D.

The depth of the water The cross-sectional area of the reservoir Density of water Atmospheric pressure

17. When the tension in the string of a guitar is increased, but other factors remain unchanged, the sound produced ________.

A. B. C. D.

Is louder Has higher pitch Has longer wavelength Travels faster

17th NSO - SET B

4

18. A windmill is pushed by four external forces as shown in the given figure. The force F required to make the windmill stand still is A. B. C. D.

10 13 15 18

22. When electrodes are immersed in water and electricity is passed, then the bubbles formed on the negative terminal is A. B. C. D.

N N N N

23. Arrange the following planets in increasing order of time required to complete one rotation around Sun.

F

19. The given diagram shows water being heated in a tin can. A thermometer hangs directly above it. In which way, does the thermal energy from the heat source reach the thermometer? A. B. C. D.

Thermometer Tin can Water

Radiation → Conduction → Radiation Radiation → Conduction → Convection Radiation + Convection → Conduction → Radiation Radiation + Convection → Conduction → Radiation + Convection

20. A person X is facing a plane mirror which is fixed. While another person Y is running towards person X from behind at a speed of 2 m s–1 as shown in the given figure. How fast does person Y seem to be running towards person X in the mirror ? Mirror A. 2 m s–1 B.

3 m s–1

C.

4ms

–1

D.

6 m s–1

X

Y

2 m s–1

21. A positively charged oil drop is suspended in the air by two charged plates as shown in the given figure. What will happen to the oil drop if the positive charge in it decreases? –––––––––– +

++++++++++

A. B. C. D.

The The The The

oil oil oil oil

drop drop drop drop

will will will will

Oxygen Hydrogen Carbon dioxide Nitrogen

move randomly. move upwards. move downwards. remain stationary.

(i) (iii) A. B. C. D.

Earth Mars (i), (ii), (iii), (iv) (i), (iii), (iv), (ii) (iv), (iii), (ii), (i) (ii), (iii), (i), (iv)

(ii) Uranus (iv) Jupiter

24. Two persons P and Q are standing at a distance of 100 m from a high wall as shown in the given figure. When P gives a clap, the time interval between the two (direct and reflected) sounds heard by Q is 0.2 s. If the speed of sound is 340 m s–1, then the distance d between P and Q is A.

160 m

B.

260 m

C.

290 m

D.

320 m

Wall

100 m d P

Q

25. The speed-time graphs for three vehicles X, Y and Z are shown. Speed (m s–1) If x, y and z are the distances travelled by 10 X X, Y and Z respectively Z 5 in 8 s, then which of the Y following comparisons 0 Time (s) 8 is correct ? A. B. C. D.

x x x x

> > = <

y y y y

= > < <

z z z z

26. Which of the following objects experience balanced forces? A. B. C. D.

A ball dropping vertically. A car accelerating uniformly from rest. A trolley moving at a constant velocity down an inclined plane. A plane flying in a circle with constant speed.

17th NSO - SET B

5

27. Spoons of different materials are used to stir a hot drink. Which of the following spoons will heat up the fastest? A. B. C. D.

Plastic spoon Steel spoon Glass spoon Wooden spoon

28. When we remove polyester or woolen cloth in dark, we can see spark and hear a cracking sound. These are due to ________. A. B. C. D.

Static electricity Current electricity Movement of charges None of these

31. Read the given statements carefully. P : I am the most common fire extinguisher but not suitable for oil, petrol and electrical fires. I am heavier than oil and also, conduct electricity. Q : I am an excellent fire extinguisher and most suitable for oil, petrol and electrical fires. I also, form a blanket around the fire and bring down the temperature of the fuel. Identify P and Q. P Q H2 O A. CO2 B. H2O CO C. O2 CO2 D. H2O CO2 32.

29. Observe the given experimental set-up and identify the gas ‘X’ and its characteristics.

Renuka, a science teacher performed the following activity to prove that air is necessary for combustion.

I

I. II. III. IV. A. B. C. D.

It is carbon dioxide. It is sulphur dioxide. It does not support combustion. It is acidic in nature. II and IV I, III and IV I and III II, III and IV

30. Namita categorised the different elements as shown below : Characteristic Na

Al

S

Fe Cu

P

a. Metal

ü

ü



ü

ü



b. Hardness

ü





ü

ü



c. Malleability



ü





ü

ü

d. Ductility





ü

ü

ü



e. Conductor of electricity

ü

ü



ü

ü



Which of the characteristics is not correctly matched by Namita? A. a, c and e B. a, b, d and e C. b, c and d D. All are correct

II

III

She asked the students to observe the flame of lighted candles placed under the glass chimneys carefully. What were the correct observations. I II III A. Flame finally Flame flickered Candle burnt went off and produced freely smoke B. Candle burnt Flame finally Flame flickered freely went off and produced smoke C. Candle burnt Flame flickered Flame finally freely and produced went off smoke D. Flame finally Candle burnt Flame flickered went off freely and produced smoke 33. Fill in the blanks. Raghav used excessive chemical fertilisers during farming which makes the soil (i) . He added (ii) to increase the production of crops. Rahul used excessive substances to neutralise the factory wastes near his field. As a result, the soil of his field became too (iii) which he treated with (iv) . (i) (ii) (iii) (iv) A. Acidic Organic matter Basic Slaked lime B. Basic Organic matter Acidic Slaked lime C. Acidic Slaked lime Basic Organic matter D. Basic Slaked lime Acidic Organic matter

17th NSO - SET B

6

Turns China rose indicator green Y Bitter in taste

Found in spinach Z

Phenolphthalein remains colourless

A. B. C. D.

Y Z Oxalic acid Milk of magnesia Soap Tartaric acid Window cleaner Ascorbic acid Milk of magnesia Oxalic acid

35. Match the Column-I with Column-II and select the correct option given below.

a. b. c. d. e. f. A. B. C. D.

Column-I Column-II Coal tar (i) Metalling the roads Petrol (ii) Manufacture of steel Coal gas (iii) Source of heat Bitumen (iv) Vaseline Coke (v) Naphthalene balls Paraffin wax (vi) Dry cleaning a-(v), b-(vi), c-(iii), d-(i), e-(ii), f-(iv) a-(i), b-(iv), c-(iii), d-(ii), e-(v), f-(vi) a-(iii), b-(v), c-(i), d-(iv), e-(ii), f-(vi) a-(iv), b-(i), c-(vi), d-(iii), e-(v), f-(ii)

38. Body temperature of some animals changes with that of atmosphere while some animals have adapted to maintain constant body temperatures. A d v i k a investigated Z this fact using three X animals X, Y and Y Z and obtained the given graph. Which of these options correctly identifies X, Y and Night Day Temperature Z? X Y Z A. Frog Lizard Rabbit B. Lizard Cobra Rabbit C. Salamander Crow Cow D. Crow Bear Frog Body temperature

34. Identify Y and Z in the given Venn diagram.

39. Run-off pollution of a particular river resulted from overuse of chemical fertilizers by a nearby farm. Which of the following graphs correctly shows the resulting changes in levels of oxygen and bacteria in this river?



A.



B.



C.



D.

36. Which of the following statements about the characteristics of organelles are correct?

(i) Mitochondria contain their own DNA. (ii) Lysosomes contain many anabolic enzymes. (iii) Secretory liver cells have abundant number of RER. (iv) Ribosomes are always found attached to the Golgi apparatus. A. (i) and (iii) B. (i) and (ii) C. (i), (ii), (iii) and (iv) D. (i), (ii) and (iv)

37. Digestion of food involves breaking down of food components into smaller molecules by enzymes. These enzymes are active only at certain hydrogen ion concentrations. As a result, certain food combinations can facilitate or retard the process of digestion. Of the following combinations, one that can result in very efficient digestion is ______.

A. B. C. D.

Meal Meal Meal Meal

with with with with

high high high high

proteins and acid fruits starch and high proteins starch and acid fruits fat and high proteins

40. The given figure represents the location of various endocrine glands in human body. Identify the glands marked as P, Q, R, S and T and select the incorrect statement regarding these.

A.



B.



C.



D.

P R Q S

T

Gland P secretes the hormone thyroxine, which regulates growth and metabolism. Gland Q secretes the hormones corticosteroids and adrenaline, which regulate breathing, heart rate, carbohydrate metabolism and mineral balance. Glands S and T secrete the hormones which control secondary sexual characters in females and males respectively. Gland R secretes the hormone insulin, whose increased concentration leads to diabetes.

17th NSO - SET B

7

41. Read the given statements and select the correct option. Statement 1 : H otspots are specific regions of megabiodiversity nations with large number of endemic species. Statement 2 : Endemic species are often threatened due to the introduction of exotic species from some other geographical area. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Statement 2 is true and statement 1 is false. 42. Select the incorrect statement from the following. A.

Synthetic fibres have little or no absorbency, although several of them do absorb oil.

B.

Wool fibre is harmed by acids including mild acids like vinegar.

C.

Cellulose fibres continue to glow after they are removed from the flame.

D.

Cotton fibres, linen and other cellulose fibres are quiet heat resistant and can be boiled safely.

43. Refer to the given diagram which shows a cross section of the stem and select the correct option.

Part X Part Y

44. Tarun sets up a plant as shown in the figure. After a few days, he observed upward growth in the roots of the plant.

Soil X

Soil X

After few days

Soil Y

Soil Y

Day 7

Day 1

Based on his observations what can you conclude? A.

Soil X is clayey while soil Y is loamy.

B.

Soil X is sandy while soil Y is clayey.

C.

Soil X is loamy while soil Y is sandy.

D.

It is not possible to tell.

45. Read the given passage in which some words are italicised. Agriculture has become more efficient with the advent of modern technology. Modern tractor driven ploughs are faster and better. Seed drills used today combine 5-6 traditional seed drills. Thus, they are faster and ensure sowing seeds at proper depth of 20-25 cm. Modern irrigation methods have also been developed which reduce water wastage. Drip irrigation is less expensive method particularly useful for soils with low water retention capacity. Sprinklers are more suited for uneven lands and sandy soils. Some of these italicised words are put incorrectly. Find out them and select the correct option.

A.

If we put a plant in red water for sometime, the colour would then appear in the part X.

B.

On girdling, swelling occurs above the girdled part due to the discontinuity of part Y.

A.

Less expensive should not be replaced as it is correctly mentioned.

C.

Conduction of water and organic solutes occurs through part Y.

B.

20-25 cm should be replaced by 10-15 cm.

C.

Low should be replaced by high.

D.

Conduction of products of photosynthesis occurs through part X.

D.

Uneven lands should be replaced by plain lands.

Achievers Section Direction : (Q. No. 46 and 47) Refer the given passage and answer the following questions. A metre ruler is held vertically in front of a plane mirror of length 15 cm as shown in the given figure. A student peeps through a hole at the 40 cm mark.

0 10 cm 5 cm

100 cm

46. The range of the scale of the metre ruler that can be seen is A. C.

10 cm to 40 cm 20 cm to 50 cm

B. D.

15 cm to 45 cm None of these

47. If the hole is at 80 cm mark of the scale, then the range of the metre ruler that can be seen in the mirror is A. C.

10 cm to 40 cm 30 cm to 60 cm

B. D.

20 cm to 50 cm None of these

17th NSO - SET B

8

48. Anuj has performed an experiment to compare the strength of different fibres. He arranged the set-up as shown in figure : Arrange the threads in order of their increasing strength. A. Nylon < Silk < Cotton B. Silk < Cotton < Nylon C. Cotton < Nylon < Silk D. Cotton < Silk < Nylon

D. Hook Threads of same length and thickness were taken Weights were put one by one till the thread broke

No. of yeast cells

No. of yeast cells

B. C.

(i) Somatic cells carry out propagation - Go to 2. (ii) Germ cells carry out propagation - Go to 3.

2.

3.

Y

A.

1.

(i) Single cell division forms new organism - P

Y

X

50. Refer the given key to identify the organisms P, Q, R, S, T and U and select the correct option.

(ii) Multiple cell divisions occur - Go to 4.

49. Swati was studying growth of yeast under different conditions of environment. She plotted two graphs but forgot to label the X axes of the graphs. Analyse the given graphs and select the correct option.

P

The environmental factor studied in the graph P can be sugar concentration in medium and in graph Q can be pH.

(i) Fertilization occurs outside parent's body - Q (ii) Fertilization occurs inside parent's body - Go to 5.

4.

(i) Each cell produced after division produces new organism - R (ii) All the cells together form a new organism - S

5. Q

X

The environmental factor studied in graph P can be pH and in graph Q can be temperature. The environmental factor studied in graph P can be temperature and in graph Q can be sugar concentration in medium. The environmental factor studied in graph P can be temperature and in graph Q can be pH.

(i) Embryonic development occurs outside parent's body - T (ii) Embryonic development occurs inside parent's body - U

A. B. C. D.

SPACE FOR ROUGH WORK

P can be yeast, Q can be chamaeleon. R can be Plasmodium, S can be Hydra. T can be duck-billed platypus, U can be ostrich. P can be yeast, U can be spiny ant eater.

Class 8

Set 1 Year 2015

logical reasoning How many such symbols are there in the given arrangement each of which is immediately preceded by a number and immediately followed by a letter?

6.

Find the missing number, if a certain rule is followed row-wise or column-wise in the given matrix. 3 ? 5 A. 4 5 4 7 B. 6 4 4 6 C. 9 36 32 114 D. 8

7.

Select the correct water image of the given Fig. (X).

58#BFL?4*M79GH2M3+84?$PQ 6R7*HT 3 5

Three different positions of a dice are shown here. Which symbol will be on the face opposite to the face with symbol * ? A. B. C. D.

3.

B. D.

×

–

*

*

+

©

Fig. (X)

+

A.

Read the following information carefully. (i)

J

A

Δ

Δ © +

A

×

A

A # B means B is at 1 metre to the right of A.

B.

×

×

J

A

D.

+

C.

(ii) A $ B means B is at 1 metre to the North of A.

A

J

2.

2 4

J

A. C.

J

1.

(iii) A * B means B is at 1 metre to the left of A. If M is facing towards North, according to M # N $ O * P, in which direction is P with respect to M? A. C. 4.

East North

B. D.

8.

West South

There is a certain relationship between figures (i) and (ii). Establish the similar relationship between figures (iii) and (iv) by selecting a suitable figure from the options which will replace the (?) in figure (iv). U

Which of the following Venn diagrams best depicts the relationship amongst "Teachers, Men, Players"? A.

S

B.

5.

D.

In which of the following options, Fig. (X) is exactly embedded as one of its part?

Fig. (X)

A.

C.

2

B.

D.

(i)

S

(ii)

? (iii)

(iv) S

B.

S

C.

9.

P P S

A. C.

T

S

G S

D.

Select a figure from the options which will continue the same series as established by the Problem Figures. Problem Figures =

A.

C.

+

+ =

=

+

=

+

+

=

= +

+ =

?

+

B.

=

D.

=

+

| 18th NSO | Class-8 | Set-1 | Level 1

10. If P + Q means 'P is the brother of Q', P × Q means 'P is the wife of Q' and P ÷ Q means 'P is the daughter of Q', then which of the following means 'A is the niece of D'?

A. B. C. D.

A÷B×C+D A×B+C÷D A+C÷B×D A÷C+B÷D

Science 11.

The speed of sound in different media is different. Which of the following options is correct regarding the speed of sound in different media? A. B. C. D.

Oxygen < Mud < Water Ice < Stone < Alcohol Fruit juice < Iron < Air Steam < Kerosene < Mercury

P

Q

R

S

A.

Big dipper

Little dipper

Pole star

Cassiopeia

B.

Little dipper

Big dipper

Cassiopeia

Pole star

C.

12. A cube of side a rests on the floor as shown in the given figure. Given that the pressure exerted by this cube on the floor is P, what is the pressure exerted by another cube of the same material of side 4a ? –1 (Take g = 10 N kg ) A. P B. 2P C. 4P a 4a D. 16P

Cassiopeia Pole star Big dipper

D.

Little dipper

Big dipper

Pole star

A. B. C. D.

Radiation → Convection → Conduction Conduction → Conduction → Convection Radiation → Conduction → Convection Radiation → Conduction → Radiation

14. United Football Club is playing an evening match. The team’s jersey has blue and white stripes. What colour would the stripes appear under floodlights which produce a yellow light? A. C.

Black and yellow Blue and yellow

B. D.

Blue and white Black and white

Coil Nail

When the switch is turned on, iron nails are attracted. Which of the following ways will make the soft iron core to attract all the iron nails? A. Decrease the number of cells B. Increase the number of turns in coil C. Place the soft iron core outside the coil D. None of these 17. A car is accelerating on a road in the direction shown in the figure. The tyre shown is connected to the engine. In which direction is the force of friction exerted by the road on the tyre? Direction of motion

15. The given diagram shows the night sky in which stars are visible. Identify P, Q, R and S.

Q

18th NSO | Class-8 | Set-1 | Level 1 |

S

P

A. B. C. D.

P Q R S

Tyre Q

S

P R

Cassiopeia

16. The diagram shows a soft iron core coiled with wire. Soft iron core S

13. The given diagram shows a brick wall in between a man and a camp fire. How does thermal energy from the camp fire reach the man?



Small dipper

Road

R

3

18. Read the given statements and select the correct option. Statement 1 : The size of a hydrogen balloon increases as it rises in air. Statement 2 : The material from which the balloon is made can be easily stretched. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Both statements 1 and 2 are false. 19. Anju walks 8 m to the east, then 6 m to the south, then 8 m to the west and finally 6 m to the north. What is the distance covered and displacement of Anju? A. B. C. D.

Distance travelled 0 m 0 m 28 m 28 m

Displacement 0m 28 m 0m 28 m

20. Deepak put twenty ice cubes of the same volume into four containers packed with different materials. He recorded the time taken for the ice to melt in each case. The table shows his results. Which of the boxes should he choose to carry ice that he needs to take to a friend’s house 120 km away? A. B. C. D.

Container with thermocol Container with ice paper Container with sand Container with sawdust

Melting time : 3 h 10 min Melting time : 2 h 05 min Melting time : 30 min Melting time : 1 h 15 min

21. A positively charged object attracts a suspended light conducting ball. The light conducting ball can be (i) (ii) (iii) A. C.

negatively charged positively charged neutral (i) only (ii) and (iii) only

B. D.

(ii) only (i) and (iii) only

22. The terminals of a battery are joined by a length of resistance wire. Which change, on its own will decrease the current through the battery? A.

4

Connecting an identical wire in series with the first one.

B. C. D.

Covering the wire with plastic insulation. Using a shorter wire of the same material and same thickness. Using a thicker wire of the same material and same length.

23. Metals are good conductors because A. B. C. D.

Outer electrons are strongly bound to the atom Outer electrons are loosely bound to the atom Inner electrons are loosely bound to the atom Protons can detach from the nucleus and conduct electricity.

24. Figure gives the speed-time graph of the motion of a car. What is the ratio of the distance travelled by the car during the last two seconds to the total distance travelled in seven seconds? A.

1:9

B.

2 : 9

C.

1:3

D.

4:9

25. Match the column I with column II and select the correct option from the given codes. (a) (b) (c) (d) (e) A. B. C. D.

Column I Column II Jupiter (i) Seven rings Saturn (ii) Red planet Mars (iii) Morning star Neptune (iv) Great red spot Venus (v) Fourteen moons (a) – (iv), (b) – (i), (c) – (v), (d) – (iii), (e) – (ii) (a) – (i), (b) – (ii), (c) – (iii), (d) – (iv), (e) – (v) (a) – (v), (b) – (iv), (c) – (iii), (d) – (ii), (e) – (i) (a) – (iv), (b) – (i), (c) – (ii), (d) – (v), (e) – (iii)

26. Each beaker shown in the given options, contains two same sized strips of different metals fastened together and immersed in hydrochloric acid. After 5 minutes, which beaker will contain the least amount of zinc ions?

B.

A. Magnesium Zinc

C.

Lead Zinc

D. Iron Zinc

Silver

Zinc

| 18th NSO | Class-8 | Set-1 | Level 1

27. Three unknown solutions are taken in test tubes. Different indicators are added to these solutions to test their nature. Phenolphthalein

Methyl orange

China rose indicator

Solution ‘X’

Solution ‘Y’

Solution ‘Z’

(1) (Turns pink)

(3) (No colour change)

(2) (Turns red)

Identify the substances X, Y and Z. X Y A. Soap solution Lime water B. Milk of Lemon juice magnesia C. Salt solution Tamarind juice D. Antacid Sour milk

Z Grape juice Slaked lime Calamine solution Glucose solution

28. Read the given statements about synthetic fibres and plastics carefully.

I.

Polycot is a mixture of two types of fibres, polyester and cotton. II. Calendar, woollen clothes and cold drink cans are all non-biodegradable. III. Uniforms of firemen have coating of nylon to make them flame resistant. IV. Polythene and PVC are the examples of thermosetting plastics. Which of these statements is/are incorrect? A. II and IV B. I and III C. Only II D. II, III and IV

29. Match the column I with column II and select the correct option from the given codes. Column I Column II P. Dark zone of flame (i) Rapid combustion Q. Source of heat and (ii) Incomplete light in sun combustion R. Burning of LPG gas (iii) Spontaneous combustion S. Luminous zone (iv) Nuclear reactions T. Burning of (v) No combustion phosphorus in air at room temperature P Q R S T A. (v) (iv) (i) (ii) (iii) B. (ii) (iv) (i) (v) (iii) C. (v) (iv) (iii) (ii) (i) D. (ii) (iii) (iv) (v) (i) 30. Solution of which of the following oxides in water will change the colour of red litmus to blue?

A. C.

Carbon dioxide B. Phosphorus trioxide D.

18th NSO | Class-8 | Set-1 | Level 1 |

Copper oxide Sulphur dioxide

31. Plants do not grow well when the soil is either too acidic or too basic. What should be added to the soil if it is too acidic?

A. C.

Lemon juice Quick lime

B. D.

Vinegar Organic matter

32. Fill in the blanks by choosing an appropriate option. I are used in the manufacture of detergents, fibres, polythene and other man-made plastics. II obtained from natural gas, is used in the production of fertilisers (urea). Petroleum is also called ____ III__ due to its great commercial importance. I II III A. Fossil fuels Petroleum gas Black gold B. Petrochemicals Coal gas Diesel C. Petrochemicals Hydrogen gas Black gold D. Coal products CNG Paraffin wax 33. Mrs. Usha, a science teacher performed the following experiments : Experiment 1 : She heated sugar in a China dish. A black substance was obtained along with caramel fumes. Experiment 2 : She mixed sand and crushed naphthalene balls in a China dish. Then she covered the China dish with a watch glass with some ice kept on it and heated. Crystals of pure naphthalene were seen on the underside of the watch glass. Identify the changes taking place in these experiments. A. Experiment 1 - Chemical change, Crystallisation Experiment 2 - Physical change, Decomposition B. Experiment 1 - Physical change, Crystallisation Experiment 2 - Chemical change, Sublimation C. Experiment 1 - Physical change, Crystallisation Experiment 2 - Physical change, Crystallisation D. Experiment 1 - Chemical change, Decomposition Experiment 2 - Physical change, Sublimation and Crystallisation

34. Read the following statements and select the option which correctly fills any three blanks.

(i)

In (a) irrigation emitters let out trickling water near the roots. (ii) Removing the chaff from the grain is called (b) , while separation of the grain from the crop is called (c) . (iii) The organic substance obtained from dead plants and animal wastes is (d) . (iv) Wheat and gram are rabi crops, while maize and (e) are kharif crops. A. (b) – Winnowing, (d) – Manure, (e) – Oats B. (b) – Winnowing, (c) – Threshing, (e) – Cotton C. (a) – Drip, (d) – Fertilizer, (e) – Mustard D. (a) – Sprinkler, (b) – Threshing, (c) – Winnowing 5

35. Refer to the given diagram of nitrogen cycle. Ammonia

T

Death

P

N2 cycle

S R

Q

Bacterial oxidation

Match the letter from the above diagram with the processes/substances given below and select the correct option. (a) Animal protein (b) Nitrate ion (c) Plant protein (d) Nitrite ion (e) Dead organic matter P Q R S T A. (b) (d) (c) (a) (e) B. (b) (d) (a) (c) (e) C. (d) (b) (a) (c) (e) D. (d) (b) (c) (a) (e) 36. Red A. B. C. D.

Data Book keeps the record of _______. Endangered animals and plants Endemic animals and plants Extinct animals and plants Both A and C

37. Study the given flow chart. Biosphere Reserve Parts X

Y

Z

Strongly protected for the conservation of biological diversity

Provides space for environmental research and education

Provides space for forestry, agriculture and tourism

Which of the following is suitable heading for X, Y and Z? X Y Z A. Core zone Manipulation Buffer zone zone B. Buffer zone Core zone Manipulation zone C. Manipulation Buffer zone Core zone zone D. Core zone Buffer zone Manipulation zone 38. Natasha put a plant cell and an animal cell of similar size in two similar dishes containing the same amount of water overnight. The next day, she observed the cells under the microscope and noticed that the animal cell has burst and the plant cell looked more bloated. She drew the following conclusions: (i) The animal cell has only a thin layer of cell membrane. When too much water enters it, it bursts. 6

(ii) Plant cell has cell wall made up of cellulose which is very strong material and prevents the cell from bursting. (iii) The plant cell contains vacuole and therefore can absorb more water. (iv) The animal cell does not possess vacuole. Which of the above given conclusions are correct? A. (i) and (ii) B. (iii) and (iv) C. (i), (ii) and (iii) D. All of these 39. Select the incorrect statement regarding the given figure. S

R

Q P T

A. B. C. D.

The part labelled P produces both male gametes and androgen. The sperms collect and mature in Q. The parts R and S have no role in reproduction. The part T is located outside the abdominal cavity and protects P and Q inside it.

40. Study the given Venn diagram. X is likely to be _______. Noise Pollution

X Land Pollution

A. B. C. D.

Water Pollution Air Pollution

A group of people smoking cigarettes Youngsters dancing in a disco A farmer spraying pesticides near a river Construction work going on at a building site

41. Which of the following organisms has been incorrectly described? Organism Adaptation A. Fennec Has large ears to increase fox exposed area to lose heat quickly B. Morning Has twining stems to climb glory up around a support C. Owl Has talons to grip prey tightly D. Walrus Has blowholes on the top of the body to allow breathing of atmospheric air while the rest of the body is under water

Habitat Desert Forest Forest Ocean

| 18th NSO | Class-8 | Set-1 | Level 1

42. Study the given flow chart. Food enters mouth

Food moves down the gullet

Food is chewed

Complete digestion of food and absorption of Q occurs

Substance P kills bacteria present in food and helps in digestion

Movement of waste for storage in rectum and extraction of substance R

B. C. D.

B. C. D.

NSERHAIG DCNRIAG GTRNSOI GURSOCNI

P Q R Saliva Nutrients Hydrochloric acid Saliva Water Waste Hydrochloric acid Nutrients Water Bile Water Waste

43. Transpiration is the loss of water from the surface of a plant. Which of the following statements describes why this process is useful for plants? A.

A. B. C. D.

45. Refer to the given figure showing cross-section of a flower and select the correct option to fill the blanks in the following paragraph.

What are P, Q and R respectively? A.

44. Unscramble the given words and select the option that gives name of the process of washing wool with soap water to remove dirt and greese.

It cools down plants, preventing overheating on sunny days. It helps the plant to get rid of excess water, protecting plant cells from bursting. It enables the mass flow of inorganic nutrients and water up the plant body. Both A and C

P

S Q

R

T

Fertilization takes place when pollen grains from the male part, (i) reach the part of the flower labelled (ii) . The (iii) increases in size and becomes the fruit, while (iv) becomes the seeds. A. B. C. D.

(i) P T S S

(ii) R Q Q R

(iii) Q Q R Q

(iv) R R Q R

Achievers section Direction : Refer to the given passage and answer questions 46 and 47. We can see an image not only on a plane surface, but also on a curved one. For example we can see our image on a steel spoon. The image formed at the outer surface of a spoon is upright and the image formed at the inner surface of the spoon is smaller and inverted. 46. The outer surface of the spoon which is bulging out acts like a ________ and inner side of spoon acts like a ________. A. B. C. D.

Concave mirror, convex mirror Convex mirror, concave mirror Plane mirror, convex lens Concave lens, concave mirror

47. If we move the spoon (inner surface) slowly away from our face, how does the image change? A. The image becomes bigger and it appears upright. B. The image becomes bigger and it appears inverted. 18th NSO | Class-8 | Set-1 | Level 1 |

C. D.

The image becomes smaller and it appears inverted. The image becomes smaller and it appears upright.

48. Refer to the given figures of bacteria X, Y and Z and read the statements (i), (ii), (iii) and (iv) regarding them.

X

Y

Z

(i) Bacterium X can be causal organism of typhoid. (ii) Bacterium Y can cause a disease which disrupts proper exchange of gases. (iii) Bacterium Z can convert lactose sugar of milk into lactic acid. (iv) Bacterium X can be the causal organism of cholera. Which of these statements are incorrect? A. (i) only B. (i) and (ii) only C. (ii), (iii) and (iv) only D. (i), (ii), (iii) and (iv) 7

49. A copper vessel exposed to moist air for a long time is shown in figure  I and sulphur powder is burnt in oxygen as shown in figure II.

1, 2, A. B. C. D.

3 and 4 are respectively CuO, CO2, SO2, H2SO3 CuCO3, Cu(OH)2, H2SO3, SO2 Cu, CuO, H2S, H2SO4 Cu(OH)2, CuCO3, SO2, H2SO3

50. Diabetics who are on rapid-acting insulin are advised not to wait more than 15 minutes to eat after taking an insulin shot. Which of the following best explains this? A. B.

C. D.

Insulin is required for the proper absorption of nutrients in the small intestine. The insulin injection may prevent the body from absorbing the glucose necessary to maintain blood glucose concentrations. The injection of insulin can lead to dangerously low blood glucose concentration. The insulin injection can lead to dangerously low blood calcium concentration.

SPACE FOR ROUGH WORK

8

| 18th NSO | Class-8 | Set-1 | Level 1

Class 8

Set 2 Year 2015

logical reasoning If it is possible to make a meaningful word with the st th th st 1 , 12 , 15 and 21 letters of the given arrangement, then which will be first letter of the word so formed? If no such word can be formed, give X as the answer and if more than one such word can be formed, give P as the answer.

8 12 9

2.

B. D.

A. C. 7.

6 5 1 4 8.

?

A.

9.

4.

D.

If '+' is called '×', '–' is called '÷', '×' is called '–' and '÷' is called '+', then the value of 16 ÷ 64 – 8 × 4 + 2 is _____. A. 12 B. C. 18 D.

5.

Study the following information carefully: (i) B5D (ii) B9D (iii) B4D (iv) B3D Which of K? A. C.

6.

2

16 24

means B is the means B is the means B is the means B is the the following

F3M5K F9M4N3K

father of D. sister of D. brother of D. wife of D. means F is the mother of B. D.

F5M3K F3M5N3K

In the given diagram, rectangle represents men, triangle represents educated, circle represents urban and square represents government employees.

7 10

B. D.

13 6

L5OGI32CAL B. LAC23IGO5L L5OGI32CAL D.

Persons X, Y, Z and Q live in red, green, yellow or blue coloured houses placed in sequence on a street. Z lives in a yellow house. The green house is adjacent to the blue house. X does not live adjacent to Z. The yellow house is in between the green and red houses. The colour of the house X lives in is ______. A. C.

B.

C.

14

11

Select the correct mirror image of the given combination of letters & numbers, if the mirror is placed vertically to the left. A. C.

Which of the following figures will continue the series as established by the Problem Figures? Problem Figures

13

Which of the following represents a man who is urban as well as government employee but not educated ?

T P

Two positions of a dice are shown below. How many dots will be on the top when 2 dots are at the bottom? A. B. C. D.

3.

M X

4

7

5

ESGBDLUNKHWACZTVXFIJMO QYPR A. C.

10 6

L5OGI32CAL

1.

Blue Red

B. D.

Green Data inadequate

In which of the following figures, Fig. (X) is exactly embedded as one of its part? A.

B.

C.

D.

Fig. (X)

10. There is a certain relationship between fig. (i) and (ii). Establish the similar relationship between fig. (iii) and (iv) by selecting a suitable figure from the options that will replace the (?) in fig. (iv). ? (i)

(ii)

(iii)

A.

B.

C.

D.

(iv)

| 18th NSO | Class-8 | Set-2 | Level 1

Science 11.

Read the given statements and select the correct option.

15. Match the column I with column II and select the correct option from the given codes.

Statement 1 : Sound travels faster on a rainy day than on a dry day. Statement 2 : Moisture increases the pressure.

Column I Column II (a) Limiting friction (i) Self adjusting force (b) Static friction (ii) Less than sliding friction (c) Dynamic friction (iii) Maximum value of static friction (d) Rolling friction (iv) Less than limiting friction A. (a) – (ii), (b) – (i), (c) – (iv), (d) – (iii) B. (a) – (iii), (b) – (i), (c) – (ii), (d) – (iv) C. (a) – (iv), (b) – (ii), (c) – (i), (d) – (iii) D. (a) – (iii), (b) – (i), (c) – (iv), (d) – (ii)

A.

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B.

Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

C.

Statement 1 is true and statement 2 is false.

D.

Both statements 1 and 2 are false.

12. A student has a large tank of water in which he wants to set up a convection current. Which of the following actions will help him to do it? A.

Cooling at Q

B.

Cooling at R

C.

Heating at P

D.

All of these

Q

–2 16. A floor has a maximum loading capacity of 5 kN m . Which of the following is allowed on this floor?

(Take g = 10 N kg–1)

R

A. Water

B.

P

C.

13. A narrow beam of white light is passed through a glass prism as shown in the figure. Narrow beam of white light

P Glass prism

R

Q Screen

Which of the following is the correct order of colours emerging from the prism? P Q R A. Red Blue Green B. Red Green Blue C. Blue Green Red D. Blue Red Green 14. The diagram shows a method to magnetise an iron nail. In which diagram will the iron nail become an induced magnet?

B.

A.

C.

N

D.

S

D. Iron bar

18th NSO | Class-8 | Set-2 | Level 1 |

An elephant weighing 50 kN stands on 4 legs with each foot covering 400 cm2 of the floor. A 50 kg lady wears a pair of high heel shoes, each 2 shoe has a contact area of 9 cm with the floor. A 100 kg washing machine stands on a surface 2 area of 6500 cm . A designer’s table weighing 1000 N stands on 2 3 legs, each leg has a contact area of 0.1 cm with the floor.

17. The diagram shows the melting and boiling points of four different substances. Which substance is in solid state at 0°C and liquid state at 1400°C ? Melting point 0

1

200 400 600

2 4

A. C.

Boiling point

1 3

Temperature(°C)

800 1000 1200 1400 1600 1800

3

B. D.

2 4

18. A vessel contains two plane mirrors at right angles to each other as shown here. If the vessel is filled with water, then the total deviation in the ray incident normally is A.

0°

B.

45°

C.

90°

D.

180°

90°

3

19. Which of the following options is true regarding the number of moons of the given planets? A. Mars < Earth < Uranus < Neptune < Jupiter B. Earth < Mars < Jupiter < Uranus < Neptune C. Earth < Mars < Neptune < Uranus < Jupiter D. Jupiter < Earth < Mars < Neptune < Uranus 20. An iron block of dimensions 5 cm × 10 cm × 15 cm has to be pushed along the floor. The force required will be minimum when the surface in contact with ground is A. B. C. D.

(10 cm × 15 cm) surface (5 cm × 15 cm) surface (10 cm × 5 cm) surface Force is same for all surfaces.

A. B. C. D.

Y Cassiopeia Orion Sirius Orion

A. C.

1 2 1 3

X

Velocity (m s–1)

22. For the velocity-time graph shown here, the distance covered by the body in last two seconds of its motion is what fraction of the total distance covered by it in six seconds?

D.

1 4 2 3

Which of the following shows the positions of balls when a heavy positively charged sphere is placed near them?

C.

4

B.

D.

B. D.

2.1 cm s–1 0.021 cm s–1

26. Rohit has performed an activity to test whether the following materials conduct electricity or not by putting them in the circuit, one at a time as shown in the figure.

10 8 6 4 2

23. Two identical neutral light conducting balls suspended by insulating threads touch each other as shown.

A.

–1

0.21 cm s 21 cm s–1

Y

0 1 2 3 4 5 6 Time (s)

B.

25. The second's hand of a watch is 2 cm long. The speed of the tip of second's hand is A. C.

21. The given diagram shows the night sky in which stars are visible. Identify the star X, and the constellation Y from the figure. X Orion Sirius Pole star Pole star

24. Which of the following statements are true? (i) Beautiful patterns formed in a kaleidoscope is due to irregular reflections. (ii) Two plane mirrors when placed parallel to each other give infinite number of images. (iii) Real image is always inverted. (iv) Virtual image can be taken on a screen. A. (i) and (ii) B. (ii) and (iii) C. (iii) and (iv) D. (i) and (iv)

Materials X and Y could be X Y A. 1, 3, 4, 6 2, 5 B. 1, 5, 6 2, 3, 4 C. 1, 3, 6 2, 4, 5 D. 2, 3, 4, 5 1, 6 27. Fill in the blanks by choosing an appropriate option. Each cell in our body contains an acid, the (i) . It controls every feature of the body such as our looks, colour of our eyes, our height, etc. Proteins that build part of our cells are also made of (ii) . The fats in our body contain (iii) . (i), (ii) and (iii) respectively are A. Amino acids, deoxyribonucleic acid, fatty acids B. Deoxyribonucleic acid, fatty acids, amino acids C. Deoxyribonucleic acid, amino acids, fatty acids D. Fatty acids, deoxyribonucleic acid, amino acids. 28. Find A. B. C. D.

the incorrect match. Haemoglobin – Magnesium Fertilisers – Nitrogen and phosphorus Chlorophyll – Iron Both A and C | 18th NSO | Class-8 | Set-2 | Level 1

29. Read the given statements and select the correct option. Statement 1 : Bakelite is used for making electrical switches and handles of various utensils. Statement 2 : Bakelite is a good conductor of heat and electricity. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Both statements 1 and 2 are false. 30. Select the incorrect statements among the following. (i) Bitumen is used for metalling the roads. (ii) Some inexhaustible natural resources like coal, petroleum and natural gas formed from the dead remains of living organisms are known as fossil fuels. (iii) Many useful substances are obtained from coal so, it is also called ‘Black gold’. (iv) Natural gas is used as a starting material for the manufacture of a number of chemicals and fertilisers. A. (i) and (ii) B. (ii) and (iii) C. (ii) and (iv) D. (i), (ii) and (iv) 31. Match the column I with column II and select the correct option from the given codes. Column I Column II P. Zinc carbonate (i) turns methyl orange red Q. Citric acid (ii) treats acidic soil R. Slaked lime (iii) potassium hydroxide S. Soap (iv) remedy for ant's bite P Q R S A. (i) (iii) (iv) (ii) B. (ii) (iv) (iii) (i) C. (iv) (i) (ii) (iii) D. (iii) (ii) (iv) (i) 32. Observe the given Venn diagram carefully.

1 – Extraction of metal from its oxide using electricity 2 – Burning of a candle 3 – Sublimation of naphthalene balls X and Y respectively are A. Physical and chemical changes B. Chemical and physical changes C. Both chemical changes D. Both physical changes. 18th NSO | Class-8 | Set-2 | Level 1 |

33. Water is not a suitable fire extinguisher to douse the fires involving oil and petrol because A. B. C. D.

Water may conduct electricity Water is heavier than oil Water cannot be stored at high pressure in cylinders Water is lighter than oil.

34. X, Y and Z are three methods of weeding. X can be done by ploughing, harrowing etc. Y involves the use of chemicals whereas Z employs biological agents to control weeds. Identify X, Y and Z and select the correct option regarding this. A. B. C.

D.

In small fields, X method involves the use of trowel or hoe which is time consuming and involves a lot of labour. Y method involves the use of poisonous chemicals like metachlor which kill the weeds and may affect the health of farmers and all the consumers. Z method is a safer method to kill weeds as it employs insects which feed on weeds thereby checking their growth and has no side effects on the crop plant and its consumers. All of these

35. Which of the following statements is incorrect regarding Biosphere Reserve? A.

B. C. D.

Biosphere Reserves are multipurpose protected areas meant for conserving genetic diversity, ecosystems and landscapes without uprooting the local people. Each Biosphere Reserve supports education and research in various ecological aspects of the ecosystem. Ample human activities like cultivation, recreation, forestry etc., are allowed in the core zone of a Biosphere Reserve. A Biosphere Reserve may include other protected areas such as National Parks.

36. The given picture shows a set-up at the start of an experiment, X and after a few days, Y. The change observed in set up Y is due to Swollen tissue

Stem with phloem removed

A. B. C. D.

X

Y

Upward movement of food getting blocked Downward movement of food getting blocked Upward movement of water getting blocked Downward movement of water getting blocked. 5

37. Use the given dichotomous key and select the correct option. I. (a) They are mostly single-celled organisms. - Go to II (a) (b) They are classified on the basis of shape. - Go to II (b) and III (b) II. (a) They live together in colonies of millions. - Go to III(a) (b) The rod shaped are called P . III. (a) They reside in our intestine and help in the process of digestion. - Q (b) The comma-shaped and spherical are respectively called R and S . P Q R S A. Spirillum Amoeba Coccus Vibrio B. Vibrio Streptococcus Spirillum Coccus C. Bacillus Plasmodium Coccus Vibrio D. Bacillus E.coli Vibrio Coccus 38. Refer to the given figure and select the incorrect statement(s).

C. D.

The scarlet king snake looks very much like the poisonous coral snake. A treehopper on a leaf or twig resembles a thorn.

41. Study the given flow chart and identify P, Q and R. Pollutants which can be decomposed by microbes No Can be Yes recycled

A. B. C. D.

P Livestock wastes Garbage

Q Styrofoam cup BHC

Sewage sludge Livestock wastes

DDT BHC

Bubbles of gas Inverted test tube Beaker Inverted funnel

P

Water containing NaHCO3

S

40. Which of these is a behavioural adaptation? A. A hognose snake pretends as dead to trick the predator. B. A frog’s light-coloured belly makes it harder for a predatory fish to see it against sunlight on the water surface.

Aluminium cans Styrofoam cup Grocery

Sunlight

Q

In Q, the sperm and ovum fuse to form zygote. Development of foetus takes place in S. R is the site of implantation of embryo. One of the functions of P is to control secondary sexual characters.

R DDT

42. Rahul conducted an experiment as shown here.

39. Refer to the given diagram with its parts labelled as P, Q, R and S. Which of the following statements is incorrect regarding this?

6

Q

No

P

The part labelled P is found in plant cell only. R (ii) The part labelled Q is cell Q wall, which provides rigidity to a plant cell. (iii) The part labelled R is the controlling centre. (iv) The part labelled R gets its shape from part labelled P. A. (iv) only B. (i) and (iv) only C. (ii) and (iii) only D. (iii) only

A. B. C. D.

P

R

(i)

R

Yes

Hydrilla plant

Support to keep funnel off bottom

Which of the following statements is correct regarding this? A. Hydrilla plant cannot photosynthesise as CO2 is not available to the plant. B. NaHCO3 present in the water absorbs all CO2 dissolved in it. C. Sunlight cannot reach the plant properly and hence photosynthetic rate of the plant is affected. D. The bubbles produced in the water within test-tube are mainly of oxygen gas. | 18th NSO | Class-8 | Set-2 | Level 1

43. Read the given paragraph. The female silk moth lays hundreds of tiny eggs at a time. The eggs are cooled to a suitable temperature to hatch. The tiny silkworms or caterpillars are kept in clean bamboo trays along with neem leaves. The caterpillars feed continuously and undergo moulting nine times. Then they stop eating and are ready to enter pupal stage. They spin cocoon around themselves which takes around eight days. Some of the words have been italicised. Select the correct option regarding them. A. Cooled should not be replaced as it is correctly mentioned. B. Neem should be replaced by pomegranate. C. Nine should be replaced by four. D. Eight should be replaced by twenty. 44. Match column I with column II and column III and select the correct option from the given codes. Column I Column II Column III 1. Budding P. Salamander a. Asexual reproduction 2. Fission Q. Yeast 3. Ovipary R. Paramecium b. Sexual reproduction 4. Vivipary S. Platypus T. Flying fox

A. B. C. D.

P a, 3 b, 3 b, 4 a, 2

Q b, 2 a, 1 a, 2 b, 1

R b, 1 a, 2 a, 1 b, 3

S b, 4 b, 3 a, 3 b, 2

T b, 3 b, 4 a, 4 b, 4

45. Rita set up an experiment as shown here. Soda lime to absorb CO2

Test-tube

Germinating seeds

Capillary tube

Drop of uid

What will happen to the drop of fluid in the capillary tube over the next few hours? A. B. C. D.

It will move away from the test tube because of oxygen output by the seeds. It will move towards the test tube because of carbon dioxide intake by the seeds. It will move towards the test tube because of oxygen intake by the seeds. It will not move, because carbon dioxide intake and oxygen output are equal.

Achievers section Direction: Refer to the given passage and answer the following questions 46 and 47. The given figure shows the electroplating of copper over a flower vase made of iron. It is done by the process of electrolysis. Battery

+

Y

X

Flower vase

Copper sulphate solution

(Z)

46. Identify X, Y and Z from the figure. A. B. C. D.

Y Cathode Anode Cathode Electrolyte

Z Electrolyte Electrolyte Anode Anode

47. During electrolysis, positively charged _______ ions move towards flower vase and negatively charged _______ ions move towards copper rod. 18th NSO | Class-8 | Set-2 | Level 1 |

Sulphate, Copper Copper, Sulphide Copper, Sulphate Sulphate, Sulphide

48. Read the given statements each with one or two blanks in it. P.

Copper rod

X Anode Cathode Electrolyte Cathode

A. B. C. D.

(i) allows water, minerals and some other necessary substances to move across cell. Q. The liquid in the nucleus is called (ii) in which are suspended thread-like structures called (iii) . R. (iv) are called powerhouse of cell whereas (v) are called kitchens of cell. S. (vi) help to destroy old cell structures and (vii) take part in protein synthesis. Select the option which correctly fills some of the blanks in these statements. A. B. C. D.

(i)-Cell wall, (ii)-Genes, (v)-Centrosome (ii)-Nucleoplasm, (iv)-Mitochondria, (vi)-Lysosomes (iii)-Plastids, (vi)-Lysosomes, (vii)-Ribosomes (v)-Chloroplasts, (vi)-Centrosome, (vii)-Endoplasmic reticulum 7

50. The given graph shows changes in levels of two factors X and Y present in a river due to run-off pollution. Levels

49. Each of the given beakers contains two metal strips of same size fastened together and immersed in hydrochloric acid.

Y X

After 5 minutes, amount of Q ions formed is greater than P ions in beaker  1, S ions is greater than R ions in beaker 2, R ions is greater than Q ions in beaker 3, and T ions is greater than S ions in beaker 4. Correct order of reactivity of these metals is A. P > Q > R > S > T B. R < P < T < S < Q C. T > R > Q > P > S D. P < Q < R < S < T

Run-off pollution

Time

Which of the following statements is correct regarding this? A. X could be an aquatic plant population whereas Y could be a fish population. B. X could be dissolved oxygen in river whereas Y could be a bacterial population. C. X could be dissolved oxygen in river whereas Y could be a fish population. D. X could be a bacterial population whereas Y could be an aquatic plant population.

SPACE FOR ROUGH WORK

8

| 18th NSO | Class-8 | Set-2 | Level 1

Class 8

Set A Year 2016

logical reasoning 1.

2.



If each vowel in the word MOUNTAIN is replaced by the next letter in the English alphabet and each consonant is replaced by the previous letter in the English alphabet, then which of the following will be the fourth letter to the left of seventh letter from the left end? A. T B. V C. N D. P Select a figure from the options which will continue the same series as established by the Problem Figures. Problem Figures

A.



5.

In which of the following options, Fig. (X) is exactly embedded as one of its part ? Fig. (X)



A.



B.



C.



D.

6.

Select the option in which specified components of the Fig. (X) are found?

B. Fig. (X)



C.

3.

Study the following arrangement carefully and answer the question given below. BA5D%RI* F H 6 #V9 $ 3 E 7 G 1 ÷ 2 M K X8UFWZN What should come in place of the (?) in the following series based on the above arrangement ? ADI F69 37÷ ? A. 2KU B. MXU C. MXF D. XUM

4.





2



D.

Two rows of numbers are given. The resultant number in each row is to be worked out separately based on the following rules. The operations on numbers progress from left to right. Rules : (i) If a two-digit odd number is followed by a prime number, the first number is to be multiplied by the prime number. (ii) If an even number is followed by another even number, the first number is to be divided by the second number. (iii) If an odd number is followed by a composite odd number, the first number is to be added to the second number. (iv) If an even number which is a multiple of 5 is followed by another number which is again a multiple of 5, the second number is to be subtracted from the first number. (v) If a number which is a perfect square is followed by another number which is also a perfect square, then the square roots of the two numbers is to be multiplied. 64 25 25 88 8 n If n is the resultant of the first row, what is the resultant of the second row? A. 24 B. 36 C. 28 D. 26



A.



C.

7.

Find the missing number, if a certain rule is followed row-wise or column-wise. 3 15 4 A. 15 B. 18 7 38 5 C. 19 3 ? 5 D. 20







B.



D.



8.

Which of the following options most closely resembles the water image of given combination of letters and numbers?



A. C.

9.

P, Q, R, S, T, V and W are sitting around a circle facing the centre. R is third to the right of V, who is second to the right of P. T is second to the left of Q, who is second to the left of W. V is sitting between S and W. Who is sitting between T and V? A. W B. R C. S D. Can't be determined





B. D.

10. Read the following information carefully. 'A«B' means 'A multiplied by B'. 'A@ B' means 'A minus B'. 'A $ B' means 'A plus B'. 'A # B' means 'A divided by B'. Mohit donates 7% of his monthly salary R to charity and spends ` 3,000 per month on his house rent. What is the amount left with him out of his monthly salary after excluding house rent and charity amount? A. R @ (3000 @ 7 « 100#R) B. R @ (7 « R # 100 @ 3000) C. R @ (R « 7 # 100 $ 3000) D. None of these | 19th NSO | Class-8 | Set-A | Level 1

Science 11.

A simple pendulum, oscillating with time period T, is shown in the figure. Time taken by the bob to move from A to C is t1 and from C to O is t2. Then

Extreme Point A

A. B. C. D.

C

O

Extreme B Point

Motion of the bob is uniform with T = 2(t1 + t2) Motion of the bob is uniform with T = 4(t1 + t2) Motion of the bob is non uniform with T = 2(t1 + t2) Motion of the bob is non-uniform with T = 4(t1 + t2).

12. A box is being pushed horizontally along a rough surface and a constant acceleration is achieved. If the push is stopped, the box will A. B. C. D.

Slow down and finally stop Continue to move at constant speed Continue to accelerate at a lower rate Stop immediately.

13. A block of mass 4 kg and dimensions 10 cm × 20 cm × 30 cm rests on the floor. If g = 10 m s–2 , then the maximum pressure the block can exert on the floor is A. C.

2000 N m–2 4000 N m–2

B. D.

1000 N m–2 1333 N m–2

14. Which of the following statements are true about both light and sound ? (i) They are forms of energy. (ii) They can be converted into other forms of energy. (iii) They undergo reflection. A. (i) and (ii) only B. (ii) and (iii) only C. (i) and (iii) only D. (i), (ii) and (iii) 15. Which of the following options correctly represents the relative positions of the Sun (S), Moon (M) and Earth (E) on the day of full moon and new moon? A. B. C. D.

Full Moon MES SME SEM ESM

New Moon MSE ESM SME EMS

16. What is the use of cooking oil in frying a fish in terms of heat transfer? A. B. C. D.

To increase rate radiation. To increase rate convection. To increase rate conduction. To increase rate evaporation.

of heat transfer to the fish via of heat transfer to the fish via of heat transfer to the fish via of heat transfer to the fish via

19th NSO | Class-8 | Set-A | Level 1 |

17. The given figure shows a set-up for testing conduction of electricity in different liquids. Pick out the group of liquids for which the bulb will not glow. A. Milk, Lemon juice, Tap water, Honey B. Vinegar, Tap water, Kerosene, Lemon juice C. Honey, Kerosene, Vegetable oil, Distilled water D. Vegetable oil, Distilled water, Vinegar, Kerosene 18. Why does a horse need to pull harder during the first few steps in pulling the cart? A. B. C. D.

Static friction is greater than sliding friction. Sliding friction is greater than rolling friction. No frictional force acts after the cart comes in motion. Air friction is greater during first few steps of motion.

19. Which of the following statements are correct? (i) Venus is the hottest planet of the solar system. (ii) Jupiter is called the red planet as it has a large red spot on its surface. (iii) Revolving speed of Mercury is fastest of all planets. (iv) Mars has no natural satellites of its own. (v) Saturn is the least dense planet among all planets. A. (ii) and (iii) only B. (ii), (iv) and (v) only C. (i), (iii) and (v) only D. (i), (ii), (iv) and (v) only 20. Two uncharged conducting spheres are placed in contact with each other. Which of the following diagrams best represents the charge distribution when a negatively charged rod is placed near one of them? A. B. C. D. 21. The intensity of sound wave gets reduced by 10% on passing through a slab. The total reduction in intensity on passing through three consecutive slabs is A. 30% B. 70% C. 27.1% D. 72.9% 3

22. The given table shows the melting and boiling points of four elements. Element E1 E2 E3 E4

Melting point 198°C –101°C 185°C 20°C

Boiling point 390°C 150°C 1087°C 160°C

Which element is in liquid state at 311°F? A. E4 B. E3 C. E2 D. E1 23. The given diagram shows a girl standing at a position X in front of a plane mirror, at a distance of x m from the mirror. When she moves y m away to a new position Y, the distance between the girl and her image increases by 8 m. What is the value of y ? A. B. C. D.

2m 4m 8m Data insufficient

24. Read the given statements and select the correct option. Statement 1 : Smoke goes upwards. Statement 2 : The warm air is lighter than the cold air. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Both statements 1 and 2 are false. 25. The given figure shows a circuit which contains three identical lamps and two switches.

Statement 2 : The process represents a physical change as the substance formed is composed of same elements sulphur, oxygen and hydrogen. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Both statements 1 and 2 are false. 27. Match the Column I with Column II and select the correct option from the given codes. Column I Column II (i) Turmeric solution (P) Aqueous solution of remains yellow sodium bicarbonate (ii) China rose indicator (Q) Aqueous solution turns green of sugar (iii) Methyl orange (R) Aqueous solution of indicator turns red ammonium hydroxide (iv) Phenolphthalein (S) Aqueous solution indicator turns pink of hydrogen chloride gas (i) (ii) (iii) (iv) A. Q, S R, S P, S P, R B. P, R S P, R Q, S C. Q, S P, R S P, R D. P Q R S 28. Fill in the blanks left in the classification of the fossil fuels. Fossil fuels

Plants and trees

26. Read the given statements and select the correct option. Statement 1 : The gas produced on burning sulphur in air is dissolved in water to form an acidic solution. 4

q

Destructive distillation Gaseous product u

Which of the following statements is correct regarding the given circuit? A. When switch 2 is closed and switch 1 is open, all the three lamps glow. B. When switch 2 is closed and switch 1 is open, only lamp 1 and lamp 3 glow. C. When switch 1 is closed and switch 2 is open, only lamp 2 glows. D. When both switch 1 and switch 2 are closed, all the three lamps glow.

Aquatic plants and animals

p

Solid residue

Fractional distillation Gaseous product w

v

p q A. Petro- Coal leum B. Coal Petroleum

Solid residue x

u v w x Petro- Bitumen Coal gas Coke leum Coal Coke PetroBitugas leum gas men

C. Coal

Petro- Coal CharGasoline Coal leum gas coal tar D. Petro- Coal Gaso- Bitumen Natural Coke leum line gas 29. When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The reaction can be represented as 2Cu + → Cu(OH)2 + Z W, X, Y and Z are respectively A. N2 , CO2 , O2 and CuO B. H2O, N2 , CO2 and O2 | 19th NSO | Class-8 | Set-A | Level 1

C. D.

H2O, CO2 , O2 and CuCO3 H2O, CO2 , O2 and CuO.

30. Fill in the blanks by choosing an appropriate option. Acids are compounds that contain (i) atoms. Sulphuric acid is one such example which is a (ii) acid. It is neutralised by alkalies and forms salts called (iii) . Acids react with metals to give (iv) gas. (i) (ii) (iii) (iv) A. Hydrogen Weak Sulphites Oxygen B. Oxygen Weak Sulphates Hydrogen C. Hydrogen Strong Sulphites Oxygen D. Hydrogen Strong Sulphates Hydrogen 31. Which of the following statements are true? I. In the luminous zone of candle flame, vaporised wax gets oxidised to carbon dioxide which burns with a blue flame. II. There is no burning in the dark inner zone of the flame. III. Non luminous zone is the hottest part of the flame. IV. Luminous zone of a f lame is mainly due to incomplete burning of carbon. A. I and III only B. II and III only C. II, III and IV only D. All of these 32. Rahul, a class 8 student conducted the following experiment and recorded the observations in the given table.

Z : I do not get wrinkled easily. I burn slowly and produce black smoke. W, X, Y and Z are respectively A. Terylene, rayon, cotton and nylon B. Bakelite, nylon, rayon and cotton C. Melamine, PVC, nylon and rayon D. Nylon, cotton, rayon and polyester. 34. Refer to the given Venn diagram and select the correct option regarding P, Q and R. Plants that grow in nitrogen deficient soil P

Plants that are leafless and rootless Q R

Plants that prepare their carbohydrates through photosynthesis

A.

B. C. D.

Plant P possesses special root like structures called haustoria for absorption of nitrogen from atmospheric air. Plant Q catches and digests insects and shows completely heterotrophic mode of nutrition. R could be Nepenthes or Rafflesia. P could be Dionaea whereas Q could be Cuscuta.

35. Refer to the given figures and select the correct option regarding species P, Q and R.

Observation

Does balloon explode?

Is ignition temperature of balloon reached? Fig. 1 Fig. 2 Fig. 1 Fig. 2 I. Yes Yes No Yes II. Yes No Yes No III. No Yes Yes Yes The correct observation and inference drawn are A. I, balloon has a higher ignition temperature than water hence, it explodes B. II, water increases the melting point of balloon C. III, water in the balloon absorbs the heat D. II, water conducts the heat away from the balloon. 33. The characteristics of different fibres are listed as W : I am strong, elastic, light and burn slowly. I shrink on heating and form hard beads with smell of burning hair. X : I burn completely leaving no residue. Y : I can be woven like silk fibres and dyed in a wide variety of colours. I burn quickly with a smell of burning paper. 19th NSO | Class-8 | Set-A | Level 1 |

A. B. C. D.

Fruits of species P burst open forcibly after drying and seeds are scattered nearby. Seeds of species R possess wings or hair-like structures. P could be Hiptage whereas Q could be balsam. Seeds of species Q are heavy and bear spines or hooks.

36. Read the given paragraph with few blanks and select the option that correctly fills up any 3 of these. (i) is the ability to blend with the surroundings. It is protective to prey insects like (ii) and also advantageous to predators like (iii) . (iv) is the resemblance of one species with another. The species which is imitated is called (v) while the species which imitates is called (vi) . A. (i) – Mimicry, (iv) – Camouflage, (vi) – Mimic B. (ii) Leaf insect, (iv) – Mimicry, (v) – Model C. (i) – Camouflage, (iii) – Praying mantis, (vi) – Model D. (ii) – Grasshopper, (iii) – Stick insect, (v) – Mimic 5

37. The given figure represents the pattern of blood circulation in human body.

Select the correct statement regarding this. A. Q and R carry deoxygenated blood whereas P and S carry oxygenated blood. B. X represents right side of heart, i.e., right atrium and ventricle. C. Q and P carry oxygenated blood whereas R and S carry deoxygenated blood. D. Y represents left side of heart, i.e., left atrium and ventricle. 38. The given figure shows positions of few endocrine glands in human body. Two patients, Ravi and Sohail recently visited an endocrinologist regarding their health issues. Doctor examined them and prepared a chart shown here to keep a record of their illness and monitor their health.

C. D.

No

Present in animal cell

Yes

Q

No

Present in plant cell

Yes

T

Yes

R

Which of the following holds true for P, Q, R, S and T ? Y W

Ravi is suffering from goitre which is caused due to hyposecretion of a hormone by gland X. Ravi is suffering from cretinism which is caused due to hypersecretion of a hormone by gland Y. Sohail is suffering from diabetes which is caused by hyposecretion of a hormone by gland W. Sohail is suffering from diabetes which is caused by hypersecretion of a hormone by gland Z.

Several species of groups X and Y help in decomposition of biodegradable wastes, thus help in waste disposal. (ii) Some species of groups X and Y possess thread like structures called hyphae. (iii) Species of X cause tuberculosis and anthrax diseases in animals whereas species of Y cause rust and smut diseases in plants.

6

Cell organelle bound by single membrane

No

Yes

X

39. X and Y are two groups of microorganisms. Group X includes all unicellular forms which lack an organised nucleus. Group Y includes both unicellular and multicellular forms with organised nucleus. Both groups do not possess chlorophyll. Identify the groups and select the correct statements regarding them. (i)

P No

Cell organelle bound by double membrane

Z

Disease symptoms Swollen neck Large quantities of sugar in blood and urine Refer to the given figure and chart and select the correct option.

B.

40. Study the given flow chart.

S

Patient's name Ravi Sohail

A.

(iv) Some species of X help in manufacture of ethyl alcohol whereas several species of Y help in biological nitrogen fixation. (v) Several species of groups X and Y are used in making antibiotics. A. (i), (ii) and (iii) only B. (i), (iii) and (v) only C. (ii) and (iv) only D. (iv) and (v) only

A. B. C.

D.

P takes part in cell autophagy and autolysis whereas Q takes part in osmoregulation. R takes part in protein synthesis and is also present in bacteria. Inner membrane of T contains stalked particles whereas inner membrane of S is connected to thylakoids at various places. T takes part in preparation of food whereas S takes part in oxidation of food to release energy.

41. The given diagram shows a respirometer that is used to measure gaseous exchange in pea seeds. The apparatus is maintained at a constant temperature.

Which of the following is incorrect regarding this? A.

B. C.

D.

The gas pressure in X will fall as O2 is absorbed during respiration and CO 2 is absorbed by potassium hydroxide solution. The fluid level at Y will fall to compensate the loss of pressure in X. The gas pressure at X will rise as O2 is given out by seeds and CO2 is released by potassium hydroxide solution. The fluid level at Z will rise due to loss of pressure at X. | 19th NSO | Class-8 | Set-A | Level 1

42. Refer to the given diagram of human male reproductive system and select the incorrect statement X regarding parts X, Y and Z. A. Z deposits sperms into the Z vagina of female during Y coitus. B. Y is similar in function to ovaries of female. C. X conducts sperms from testis to urethra. D. Y lies within scrotum in the abdominal cavity. 43. Identify P, Q and R in the given flow chart and select the correct option regarding them. Threatened species No

Extinct species

Yes Vulnerable species

No Endangered species

Yes

A. B. C. D.

R

Yes P

Yes Q

P – Passenger pigeon, Q – Golden langur, R – Great Indian bustard P – Sloth bear, Q – Chinkara deer, R – Asian elephant P – Olive Ridley turtle, Q – Komodo dragon, R – Blue whale P – Dodo, Q – Red panda, R – Indian rhinoceros

44. Read the following statements and select the correct option. A. B. C. D.

A daughter receives X-chromosome from her mother only. Human beings possess 22 pairs of autosomes and 1 pair of sex chromosomes. A new human individual develops from a cell called gamete only. Pituitary gland produces thyroxine.

45. Match column I with column II and select the correct option from the given codes. P. Q. R. S. T. U. A. B. C. D.

Column I Column II Anopheles (i) A fungus from which antibiotic is obtained Rhizobium (ii) A viral disease Penicillium (iii) A bacterium responsible for curdling of milk Hepatitis B (iv) Nitrogen fixing bacterium Lactobacillus (v) Edible fungus Mushroom (vi) Vector for malarial parasite P-(vi), Q-(iv), R-(i), S-(ii), T-(iii), U-(v) P-(ii), Q-(v), R-(iii), S-(i), T-(vi), U-(iv) P-(iv), Q-(vi), R-(i), S-(v), T-(ii), U-(iii) P-(i), Q-(iii), R-(iv), S-(ii), T-(vi), U-(v)

Achievers Section

46. The maximum time interval during which a man inside the balloon can see the image of the source in the mirror is A. C.

2.2 s 4.6 s

B. D.

1.7 s 0.5 s

47. When the balloon is at a height of 17 m from the ground, the man drops a stone from it then the maximum height attained by the stone will be (g = 10 m s –2) A. C.

17 m 22 m

19th NSO | Class-8 | Set-A | Level 1 |

B. D.

20 m 27 m

48. The given graph shows the changes in various factors (P, Q and R) present in a water body after the sewage discharge at point X. Amount/Number

DIRECTION (Q. No. 46 and 47) : Refer to the given passage and answer the following questions. A balloon is moving upwards  from ground with a constant speed of 10 m s–1 at a distance 5 m infront of a plane mirror of length 2 m as shown in figure. A source S is placed symmetrically before plane mirror. The plane mirror is placed at a height H = 15 m above the surface of ground.

O

P

X

R

Q

Sewage discharge Distance downstream

Refer to the given graph and select the correct option regarding P, Q and R. A. B.

C. D.

P could be bacteria which increase tremendously in number to decompose nitrogen rich sewage. Q corresponds to biological oxygen demand which decreases due to accumulation of sewage on water surface. R could be aquatic animals like fish which die on account of non-availability of dissolved oxygen. Both A and C 7

49. Ms. Deepika, a science teacher demonstrated an activity in the science lab and the experiment was set up as shown in the figure. Syringe steam metal X

heat The metal ‘X’ reacts with steam to form a gas ‘Y’ which is collected in the syringe. Which of the following best describes the metal ‘X’ and gas ‘Y’? A. B. C. D.

Metal ‘X’ is silver and gas ‘Y’ is hydrogen which burns with a pop sound. Metal ‘X’ is sodium and gas ‘Y’ is carbon dioxide which gives white precipitate with lime water. Metal ‘X’ is iron and gas ‘Y’ is hydrogen which burns with a pop sound. Metal ‘X’ is magnesium and gas ‘Y’ is carbon dioxide which gives white precipitate with lime water.

50. Read the given paragraph where few words have been italicised. Preparation of soil in a field, before sowing of seeds involves two steps : broadcasting and levelling. Soil in the crop field is enriched with nutrients by adding manures and fertilisers to it. Crop fields need to be irrigated from time to time. In sprinkler system of irrigation water is allowed to fall drop by drop from a pipe just near the plant roots whereas in drip irrigation water escapes from a revolving nozzle. Weeding in crop fields can be done using thresher. After the crop is harvested, the grain is separated from cut crop using a machine called harvester. Select the correct option regarding these. A. B. C. D.

Broadcasting should be replaced by winnowing. Positions of sprinkler system and drip irrigation should be interchanged. Thresher should not be replaced as it is correctly mentioned. Harvester should be replaced by seed drill.

SPACE FOR ROUGH WORK

8

| 19th NSO | Class-8 | Set-A | Level 1

Class 8

Set B Year 2016

logical reasoning 1. 2.



3.

The minimum number of straight lines required to make the given figure is _____. A. 23 B. 22 C. 17 D. 18 The following letters are coded as follows. Letter :BMKATREUNHFIWDP Digit/Symbol : 7 % 5 © 6 9 8 2 @ 1 # $ 3 « 4 While coding the given letters following conditions are also to be observed. Conditions : (i) If the first letter is a vowel and the last letter is a consonant, both are to be coded as the code for the vowel. (ii) If the first letter is a consonant and the last letter is a vowel, codes for these two are to be interchanged. (iii) If both the first and the last letters are consonants, both are to be coded as the code for the last letter. MATRBW A. % © 6973 B. 3 © 6973 C. % © 697% D. 3 © 697% Select the figure from the options which will replace the (?) to complete the given figure matrix.



A.



B.



C.



D.

4.

Mini goes to the Departmental Store, which is to the North of her house, 6 km away by an auto. After the shopping she decides to visit her friend Trishu, hence turns to the right and reaches her friend’s house which is 8 km away. From there she visits a shop which is 6 km away, taking a right turn. Finally, she turns to the right and phones up to the house to send the car. In what direction should the driver take the car to pick up Mini to bring her back?



A. C.

6.

How many odd numbers are there in the following series which are immediately followed by an odd number? 51473985726315863852243496 A. 1 B. 2 C. 4 D. More than 4

7.

?



A. C.

West South

B. D.

East North

5.

Three of the following four are alike and hence form a group. Which one does not belong to that group?

NSWX HMQR

B. D.

KPSU EJNO

Two positions of a dice are shown below. When there are two dots at the bottom, the number of dots at the top will be _______. A. 3 B. 5 C. 6 D. Cannot be determined

8.

Which of the following Venn diagrams best depicts the relationship amongst, ‘Singers, Dancers, Actors’ ?



A.



C.

9.

A square transparent sheet with a pattern is given. Find the option as to how the pattern would appear when the transparent sheet is folded along the dotted line.



A.



B.



C.



D.





2







B.

D.

10. Six friends – Mohit, Arun, Amit, Samrath, Aman and Siddharth are studying six different specialisations which are – metallurgy, telecommunication, humanities, mechanical, electrical and electronics not necessarily in the same order. Each one likes a different sport which are hockey, cricket, swimming, football, badminton and tennis again not in the same order. Samrath is not studying electronics. Aman is studying humanities and likes hockey. Amit likes swimming and is not studying electronics. The one who likes football is studying electrical. Siddharth is studying mechanical and does not like tennis. The one who likes badminton is studying telecommunication. Mohit and Arun do not like badminton. Mohit does not like tennis. Which sport does Mohit like?

A. C.

Football Hockey

B. D.

Cricket None of these

| 19th NSO | Class-8 | Set-B | Level 1

SCIENCE 11.

The speed-time graphs of motion of two bicycles X and Y are shown here. If at t = 0 s, both X and Y are at same position, then at what time will they be at same position again? –1 A.

2s

B. C. D.

2.5 s 5s After 6 s

Speed (m s ) 10 8 6 4 2

water before and after heating. Which of the following correctly describes the temperature recorded by the thermometer as compared to the actual temperatures of the water before and after heating, and the temperature difference recorded by the thermometer and the actual temperature difference? Reading Reading Temperature before after difference heating heating A. Lower Lower Low B. Lower Higher High C. Lower Lower Same D. Higher Higher Same

X

Y 0 1 2 3 4 5 6

Time(s)

12. A solid object moving through a fluid experiences a frictional force exerted by the fluid. At a particular instant the frictional force exerted by the fluid does not depend on A. B. C. D.

Shape of the object Speed of the object Nature of the fluid Volume of the fluid.

13. The given figure shows a statue. It exerts a pressure of 340 Pa on the floor. What is the weight of the statue if base area of its one foot is 17 cm2 ? A. C.

5.780 N 1.156 N

B. D.

1000 N 2000 N

14. While trying to put out a fire in an electric appliance, we should pour______ on it. A. C.

Distilled water Rain water

B. D.

19. The diagram shows a converging lens producing an upright and virtual image. Which of the following optical instruments uses this arrangement? A. A camera B. A magnifying glass C. A photographic enlarger D. A projector

Tap water Salt water

15. Which of the following statements is incorrect about constellation? A. It is a group of stars that has recognisable shape. B. It appears to move in the sky from east to west. C. It consists of large number of stars but we are able to see only the bright ones. D. All the stars of a constellation are at the same distance from us. 16. Which of the following statements about conduction are true? (i) Conduction can transfer heat faster in denser medium. (ii) Conduction can transfer heat faster through good electrical conductors. (iii) C o n d u c t i o n c a n n o t h a p p e n a l o n g w i t h convection. A. (i) and (ii) only B. (i) and (iii) only C. (ii) and (iii) only D. (i), (ii) and (iii) 17. A student is given a thermometer that reads –1°C for the lower fixed point and 99°C for the upper fixed point. He uses the thermometer to measure the temperature of some 19th NSO | Class-8 | Set-B | Level 1 |

18. Read the given statements and select the correct option. Statement 1 : It is difficult to drive a vehicle at high speed on a rainy day. Statement 2 : Friction depends on the nature of surfaces in contact. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Both statements 1 and 2 are false.

20.

Lens

Meera’s father was born on February 2, 1977. How many complete turns has he gone round the sun till October 20, 2016? A. C.

21.

Image Object

28 40

B. D.

39 77

Match the column I with column II and select the correct option. P. Q. R. S. A. B. C. D.

Column I Convex mirror 1. Convex lens 2. Concave lens 3. Concave mirror 4. P–2, Q–3, R–4, S–1 P–2, Q–4, R–1, S–3 P–1, Q–4, R–3, S–2 P–3, Q–1, R–4, S–2

Column II Peep-hole in the door Shop security mirror Reflector of torch Magnifying glass

3

22. Rearranging charges in uncharged metal object without contact with charged object is called

A. C.

Conduction Insulation

B. D.

Discharge Induction.

23. Two plane mirrors AB and CD are placed at right angle to one another. A ray of light PQ hits AB at Q making an angle of 45° as shown in the diagram. This ray will be reflected from mirror CD at an angle of D



A. B. C. D.

A

20° 35° 45° 60°.

45°

Plane mirror

P Q

90°

C

B

Plane mirror

24. The given figure shows a circuit which contains three identical bulbs B1, B2 , B3 and four switches S1, S 2 , S 3 and S 4. B1

S1

B2 S3



B3

S2

27. Sohail conducted an experiment by taking a candle and a steel spoon. He put the spoon in the middle of the yellow part of the candle flame for a few seconds. He observed black deposition on the spoon. What can be concluded from this experiment?



A.



B.



C.



D.

28. Study the given table carefully and choose the incorrect match.

S4

S. Object/ No. material I. Iron nail

Which of the following combinations of switch positions will make all the three bulbs to glow?

A. B. C. D.

S1 Closed Closed Open Closed

S2 Open Closed Closed Open

S3 Closed Open Closed Closed

S4 Open Closed Closed Closed

25. It is known that normally at 90 dB, it takes about 8 hours for the damage to receptor nerves of ear to occur. Further, it is found that if the sound level is increased by 5 dB, the safe exposure limit is cut to half. Based on the information, what is the non-stop exposure time for a 105 dB sound to damage the ear?

A. C.

1 h 4 h

B. D.

2h 5h

26. Three colourless liquids I, II and III are tested with red and blue litmus papers with the following results: Paper I Red litmus Stays red Blue litmus Turns red

II Stays red Stays blue

III Turns blue Stays blue

Which of the following is the correct identification of I, II and III? A. I is lime water, II is common salt solution and III is hydrochloric acid. B. I is amla juice, II is lemon juice and III is caustic soda solution. C. I is vinegar, II is sugar solution and III is baking soda solution. D. I is window cleaner, II is milk of magnesia and III is soap solution.

4

Wax is an inflammable substance hence, it burns with a smoky flame. Unburnt carbon particles produce smoke (soot) which gets deposited on the spoon. Yellow region of the flame is the hottest hence, it produces smoke. Out of three colours (blue, black and yellow) of the flame, black being the darkest gets deposited on the spoon.

Malleability

Conductor of electricity





  

  

II. Coal piece III. Aluminium block IV. Pencil lead

A. C.

I and II only I, III and IV only

B. D.

II and III only All of these

29.

Some materials are listed as : (a) Cotton (b) Dacron (c) Bakelite (d) Jute (e) Terylene (f) Melamine They are classified as (i) Biodegradable (ii) Manufactured from petroleum products (iii) Thermosetting plastics Choose the correct match. A. (i) – c, d; (ii) – a, e; (iii) – b, f B. (i) – d, f; (ii) – a, c; (iii) – b, e C. (i) – a, d; (ii) – b, c; (iii) – e, f D. (i) – a, d; (ii) – b, e; (iii) – c, f

30. In a biogas plant, anaerobic bacteria digest animal waste and produce biogas (Process I) which is burnt as household fuel (Process II). In the given Venn diagram, processes I and II are best described by point(s) Physical change



A. C.

1 3

1

2

3

Chemical change

B. 2 D. 1 and 3 respectively. | 19th NSO | Class-8 | Set-B | Level 1

31.

32.

A brief description of four substances is given as: W : Obtained from natural gas and is used in the production of urea. X : Contains mainly carbon and is obtained by carbonisation of dead vegetation. Y : A petroleum product used for road surfacing. Z : Used as a fuel for jet aircrafts. W, X, Y and Z are respectively A. CNG, coke, coal tar and diesel B. Hydrogen, coal, bitumen and kerosene C. Coal gas, coke, coal tar and kerosene D. Hydrogen, coke, bitumen and diesel.

35. Given figure represents a breathing process.

Observe the given flowchart and mark the appropriate option correctly representing I, II and III. Substances

36. Refer to the given dichotomous key and select the correct option regarding P, Q, R, S and T. I. (a) It is a method of asexual reproduction in plants. - Go to II (b) It is a method of asexual reproduction in animals. - Go to IV II. (a) Vegetative propagation by leaves – P (b) Vegetative propagation by stems – Go to III III. (a) Vegetative propagation by rhizomes – Q (b) Vegetative propagation by bulbs – R

(I) in taste.

A. B. C. D.

Bitter in taste.

(III) neutralises the Wasp stings effect of wasp sting. are (II). I II III Sweet Neutral Baking soda Sour Acidic Calamine Sour Alkaline Vinegar Sweet Alkaline Calamine

en

yg

Ox

n itio ign ain e) att tur (to era at emp t

He

33. Fire triangle is represented as shown in the figure: Eliminating one or more of the three factors helps in fighting fire. Water, which is the most common fire extinguishing agent works by Combustible substance A. Raising the ignition temperature of the substance B. Removing the combustible substance C. Removing heat and oxygen D. Supplying CO2 which covers the fire like a blanket. 34. The given figures show two kinds of fruits.

During this process __________. A. Air from atmosphere rushes into the lungs B. Volume of thoracic cavity and lungs decreases C. The air pressure inside the lungs decreases D. Both A and B

IV.

(a) Reproduction through binary fission – S (b) Reproduction through budding – T A. B. C. D.

P – Potato, Q – Turmeric, R – Spirog yra, S – Plasmodium, T – Hydra P – Br yophyllum, Q – Ginger, R – Onion, S – Amoeba, T – Hydra P – Colocasia, Q – Mint, R – Potato, S – Paramecium, T – Sponge P – Strawberry, Q – Chlamydomonas, R – Onion, S – Paramecium, T – Yeast

37. A factory is built beside a river. Water used to cool the machines as well as some factory waste containing mercury are discharged into the river as shown in the given diagram. Factory

X Y How are X and Y adapted for their dispersal in the surroundings? X Y A. Fleshy and sweet Hair-like structure to stick to attract animals onto bodies of animals B. Wing-like structure Hook-like structure to stick to enable to float onto fur of animals on water C. Air trapped within Hair-like structure to enable its structure to enable to float on water to float on water D. Wing-like structure Hair-like structure to get to get blown off with blown off with the wind the wind 19th NSO | Class-8 | Set-B | Level 1 |

Z

Water used to cool the machines W

X

Y River

Factory waste

Which of the following statements are correct regarding this? A. The quantity of fish in area W is the highest as compared to those in areas X, Y and Z. B. The fish present in area Z are not consumable as they are likely to contain poisonous mercury. C. Areas X and Y are directly affected by pollution so the chances of getting fish in this area are negligible. D. All of these 5

38. Anita bought a bunch of blue flowers with intact stems from the market. In order to find out whether the colour was artificially introduced or not, she prepared a section of the stem and observed it under the microscope. Which of the following correctly shows the condition of the section, if the colour was artificially introduced in flowers. (The dark area is the place where the colour is present).

(iii) Testes are S sex organs of males which lie within T . (iv) The clone sheep U was developed by using cells from V and Scottish Blackface sheep. A. Q - Oviparous, S - Secondary, U - Rosie B. P - Metamorphosis, R - Viviparous, V - Finn Dorset C. Q - Viviparous, T - Seminal vesicle, U - Dolly D. R - Oviparous, S - Accessory, T - Scrotum 42. Refer to the given flow chart.

A.

B.

Microorganism Yes

Cell wall is present C.

D.

Yes

Organised nucleus is present

No

P

Chlorophyll is present

No

Q

Yes

39. Read the given paragraph. Organism X has leathery lips and a big hump, organism Y has thick layer of fur on skin and thick layer of subcutaneous fat whereas organism Z is brilliantly coloured and has sticky pads on its feet. Which of the following holds true for organisms X, Y and Z ? A. Organism X lives in a place inhabited by xerophytic plants. B. Organism Y hibernates in extreme winters. C. Organism Z creates ghost images and uses startling colouration to elude its predators. D. All of these 40. Refer to the given figure of a plant cell and select the correct statement regarding organelles P and Q.

R

Yes

Identify organisms P, Q and R and select the correct option regarding them. A. P could be a multicellular microbe which causes tetanus in humans. B. Q is always unicellular and could be saprophytic or parasitic. C. R could be a unicellular biflagellate microorganism which forms an important component of phytoplanktons. D. P can reproduce only inside cells of host organisms and behaves as non-living entity outside the living systems. 43. Refer to the given Venn diagram. Area meant Area meant for protection X for protection of ora of fauna Y Area where limited human economic activities allowed

A. B. C. D.

P synthesises energy but Q synthesises lipids. Presence of both P and Q in a plant cell maximise the rate of photosynthesis. P takes part in photosynthesis whereas Q takes part in protein synthesis. Amount of P and Q remains fixed in all cell types.

41. Read the following statements with few blanks and select the option that correctly fills any three of these blanks. (i) P is the transformation of a larval form into an adult animal. (ii) Egg laying animals are called Q whereas animals which give birth to babies are known as R . 6

Identify X and Y and select the correct option regarding them. A. X is an in situ method of biodiversity conservation whereas Y is an ex situ method of biodiversity conservation. B. Human activities are allowed only in the core zone of Y however the buffer zone remains undisturbed. C. X is an area that is owned and protected by a national government for the purpose of recreation and development. D. Hunting of animals is allowed in core zone of Y however, it is prohibited in all parts of X. | 19th NSO | Class-8 | Set-B | Level 1

44. Read the given statements and select the correct option. Statement 1 : A plant or animal species which is exclusively found in a particular area and is not found naturally anywhere else, is known as endemic species. Statement 2 : The existence of endemic species is often threatened due to the introduction of exotic species from some other geographical area. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Both statements 1 and 2 are false. 45. Refer to the given nitrogen cycle occurring in nature and select the correct option.

A. B. C.

D.

Parasitic bacteria and fungi play an important role in process II. If process I does not take place then there will be no recycling of nutrients. Nitrogen fixation by free living and symbiotic bacteria and lightning process both could be process III. Both B and C

Achievers Section Direction : Refer to the given passage and answer questions 46 and 47. The given figure shows two men M and N, facing two flat and hard walls, wall 1 and wall 2. Wall 2 y

Which of the following statements is correct? A. B. C.

Wall 1 500 m

D.

2400 m N M Man N fires a gun, man M hears two echoes, one from wall 1 and second from wall 2. The speed of sound in air is given to be 325 m s–1. 46. After the firing of a gun by the man N, the man M will hear the first echo in A. 4.0 s B. 8.9 s C. 8.0 s D. 10.5 s.

47. If the time difference between the two echoes as heard by man M is 1.23 s, then distance between the walls, y is A. 400 m B. 900 m C. 500 m D. 1300 m. 48. Ms Nisha, a science teacher set up the given apparatus to demonstrate displacement reactions : CuSO4 solution Fe filings

(I)

ZnSO4 solution Fe filings

(II)

FeSO4 solution Cu turnings

19th NSO | Class-8 | Set-B | Level 1 |

(III)

CuSO4 solution Zn granules

(IV)

Copper will be precipitated in beaker I and there will be no change in beakers, II, III and IV. Copper will be precipitated in beaker IV and solutions in beakers I, II and III will become colourless. There will be no change in beakers II and III and solutions in beakers I and IV will turn green and colourless respectively. There will be no change in beakers II and III and solutions in beakers I and IV will become colourless and green respectively.

49. Read the given paragraph where few words have been italicised. Monoculture is growing of a single crop in one habitat. It makes mechanical harvesting easy and reduces pest infestation. But, it removes some nutrients specifically from the area. Hence, crop rotation is more prevalent wherein leguminous and non-leguminous crops are grown simultaneously on the same field. It replenishes the soil with magnesium and improves soil fertility. It also increases pest infestation. Select the correct statement regarding this. A. B.

C. D.

Monoculture should be replaced with tissue culture. Easy should not be replaced as it is correctly mentioned while magnesium should be replaced with boron. Simultaneously should be replaced with alternately. Reduces and increases should not be replaced or interchanged as they are correctly mentioned. 7

50. The graph given below shows the changes in the blood glucose concentrations of a healthy person and a person with condition X. Blood glucose level (mg/dL)

Person with condition X

Healthy person



Refer to the given graph and select the incorrect statement regarding it.



A.



B.



C.



D.

Time after meal (min)

Person with condition X needs to take insulin injections before meals. Urine of person with condition X contains some amount of glucose. Condition X arises due to malfunctioning of few cells of pancreas. Condition X is the consequence of deficiency of iodine in body.

SPACE FOR ROUGH WORK

8

| 19th NSO | Class-8 | Set-B | Level 1

Class 8

Set A Year 2017

LOGICAL REASONING 1.

Select a figure from the options which will complete the given figure matrix.

8

+

×

4 16

? +

A. 12

× 6.

×

C.

2.

3.

D.

×

Study the given information carefully and answer the question that follows.  P, Q, R, S, T, U and V are sitting in a row facing North.  T is to the immediate right of V.  P is the neighbour of R and U.  V is 4th to the right of Q.  Person who is third to the left of U is at one of the ends. Who is second to the right of U? A. T B. V C. S D. P Which of the following options does not satisfy the same condition of placement of dots as in Fig. (X)?

A.

B.

C.

D.

5.

B. 16

8

12 27

C. 14

D. 9

The given question consists of a set of four figures P, Q, R and S showing a sequence of folding of a piece of paper. Fig. (S) shows the manner in which the folded paper has been cut. Select the figure from the options which would most closely resemble the unfolded form of Fig. (S).

P

A. 7.

In a certain code language, if 'TUTORIAL' is written as 'WRWLUFDI', then how will 'GUIDANCE' be written in that language? A. HFQDGLXJ B. FGPLKYJZ C. JRLADFKB D. JRLADKFB Find the missing number, if same rule is followed in all the three figures.

R

Q

B.

C.

S

D.

In which of the following figures, Fig. (X) is exactly embedded as one of its parts? Fig. (X)

A.

B.

C.

D.

8.

How many pair of letters are there in the word OPERATION which have as many letters between them in the word as in the English alphabet? A. Five B. Six C. Seven D. More than seven

9.

Which of the following options will continue the same series as established by the Problem Figures? Problem Figures

Fig. (X)

4.

18

×

B.

×

A.

18

?

A.

B.

C.

D.

10. Priyanshu walked 8 m in East, then he turned right and walked 3 m. Again he turned to the right and walked 12 m. How far is he now from the starting point? A. 20 m B. 4 m C. 5 m D. 23 m

SCIENCE 11.

2

A 20 Pa pressure is applied on the head of a nail placed perpendicular to the surface of a wall. If the area of cross-section of the tip of the nail is (1/10) times the area of cross-section of the head, the pressure

exerted at the wall is A. 10 Pa

B. 20 Pa

C. 200 Pa

D. None of these. | NSO | Class-8 | Set-A | Level 1

Metal rod

Insulating handle

P

Q

Earth



What are the charges on P and Q after the rod is placed in contact with them? Charge on P Charge on Q A. Positive Positive B. Positive Uncharged C. Uncharged Positive D. Uncharged Uncharged

13. A fire can be made by rubbing two objects together such as rubbing two pieces of rock having rough surfaces. Which of the following statements explain why a fire can be made by rubbing two objects together? (i) Friction slows down moving objects. (ii) Fire gives out heat and light energy. (iii) Friction produces heat. (iv) Fire has no mass. A. (ii) only B. (iii) only C. (i), (ii) and (iii) only D. (ii) and (iv) only 14. Two forces of equal magnitude F act on two isolated bodies P and Q as shown in the figure. The mass of body Q is three times that of body P. The magnitude of the acceleration of P is Q P

A. Three times that of Q B. (1/3) that of Q C. Nine times that of Q D. (1/9) that of Q.

15. The speed of sound in air, water and steel is different. If the speed of sound in air, water and steel is represented by Va , Vw and Vs respectively, then which of the following sequences is correct about the speed of sound in ascending order? B. Vs, Vw, Va A. Va, Vw, Vs C. Vw, Vs, Va D. Va, Vs, Vw 16. In the given figure, two mirrors X and Y are situated at an angle of 60° with each other and a ray of light is incident on mirror X at an angle of 50°. When the ray is reflected by the mirror Y, then what is angle of reflection at this mirror? 50° A. 35° X B. 55° C. 50° 60° D. 20° Y 17. The diagram shows identical lamps X and Y connected in series with a battery. The lamps light with normal NSO | Class-8 | Set-A | Level 1 |



brightness. If a third identical lamp Z is connected in parallel with lamp X, then what will happen to the brightness of lamp Y? A. Brighter than normal Y B. Normal X C. Dimmer than normal D. Very dim (cannot be seen)

18. The device used to prevent the flow of excess current in the circuit is A. Switch B. Fuse C. Bulb D. Coil. 19. Read the given statements and select the correct option. Statement 1 : The seasons are caused by the tilt of Earth's axis. Statement 2 : The axis of Earth is tilted at an angle 1° to the plane of its orbit. of 23 2 A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Statement 1 is false but statement 2 is true. 20. Three containers P, Q and R made of metal are filled with chilled water, ice cubes and boiling water with vapour respectively. These containers are kept at room temperature. Which of the following graph shows the temperature variations in all the containers correctly? Temperature (°C)

Temperature (°C)

100

100

A. R 0

P Q

Temperature (°C) R

C.

P 0

Time (min)

100 P

R

B.

Time (min)

Temperature (°C) 100 R

D. P

Q 0

Q

0

Time (min)

Q Time (min)

21. The displacement-time graph of a lift climbing 60 from the ground floor to 50 C the top of the building is 40 B given here. Which of the 30 following statements are 20 true about the graph? 10 A (i) At point A, the lift 0 1 2 3 4 5 6 7 Time (s) is stationary. (ii) Velocity of lift is decreasing from point B to C. (iii) At point C, the lift is at zero velocity. (iv) Velocity of lift is minimum at B. A. (i) and (iii) only B. (ii) and (iv) only C. (i), (ii) and (iii) only D. (ii), (iii) and (iv) only Displacement (m)

12. Two metal spheres are mounted on insulating stands. Sphere P is initially uncharged and sphere Q is initially positively charged. A metal rod, held by an insulating handle, is placed in contact with P and Q as shown.

3

22. A cylinder is placed on a balance as shown in the figure. Water is poured into the cylinder and the reading of the balance is recorded for different heights of water in the cylinder.

Water

Which graph correctly shows the variation of the balance reading (say m) with the height (say h)? m m A.

B. 0

h

0

m

h

m

C.

D.

0

0

h

h

23. Fill in the blanks by choosing an appropriate option. The loudness of sound depends on its (i) . The (ii) determines the pitch of a sound. A bird makes a (iii) sound where as a lion makes a (iv) sound. Usually voice of a woman has a (v) frequency than that of a man. A. B. C. D.

(i)

Amplitude Pitch Amplitude Frequency

(ii)

Frequency Frequency Frequency Pitch

(iii)

Low-pitched Low-pitched High-pitched High-pitched

(iv)

High-pitched High-pitched Low-pitched Low-pitched

(v)

Lower Lower Higher Higher

24. Read the given statements and select the correct option. Statement 1 : It takes a much longer time and covers  more distance to stop a moving ship in water than a moving car with same speed on the road. Statement  2 : The friction on water surface is much less than the solid surface. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Statement 1 is false but statement 2 is true. 25. A person standing at the centre of a rectangular room is looking into a 1 m long mirror at the opposite end of the room. How much of the painted wall can he see through the 1 m long mirror? 1m A. 1 m Mirror B. 2 m Person 12 m C. 3 m Painted wall D. 4 m ↓ 26. Which of the following statements is/are correct? I. The flame of a Bunsen burner is blue when the air hole is open and yellow when the air hole is closed. II. The liquid or solid wax never catches fire. 4

III. A substance cannot catch fire if its temperature is higher than its ignition temperature. IV. Water should be poured over burning petrol, kerosene or diesel. V. The middle zone of a candle emits the least light. A. I and II only B. III and IV only D. V only C. II, III and IV only 27. Rupali, a class 8 student classified a few changes occurring around us as shown in the table : S. No. Change Chemical Physical Reversible I. Making batter    for idli II. Bursting of    crackers III. Formation of    clouds IV. Germination of    seeds V. Ironing of    clothes Which of her observations are incorrect? A. I and II only B. II and III only D. II, III, IV and V only C. I, IV and V only 28. Ms Shelja, a science teacher conducted an activity as shown in the given figure : She collected the ash and made Magnesium Magnesium its solution with water. ribbon ribbon Which of the following statements Ash Ash is/are correct? I. The formula of the ash is MgO. II. The solution formed will turn methyl orange pink and phenolphthalein colourless. III. The solution will have no effect on blue litmus paper. A. I only B. I and III only D. I, II and III C. II only 29. Suhani, a class 8 student has listed the important properties and uses of a few plastics in the given table. Plastics Properties Uses Light weight For making adhesive tapes W and as an insulator for electric wires ThermoFor making soles of shoes X plastic and sanitary fittings ThermoFor making electrical switches Y setting and plugs Hard, highly For making floor tiles and Z polished kitchenware W, X, Y and Z could be respectively A. Polystyrene, polythene, melamine and teflon B. PVC, polythene, bakelite and melamine | NSO | Class-8 | Set-A | Level 1

C. Polythene, PVC, bakelite and melamine D. Polythene, melamine, bakelite and teflon. 30. Match column I with column II and select the correct option from the given codes. P. Q. R. S.

A. B. C. D.

Column I Non-metal essential for all living beings Non-metal used in fertilisers to enhance growth of plants Non-metal used in water purification process Non-metal whose purple coloured solution is used as an antiseptic P– P– P– P–

(iv) Carbon

34. Following is the data of four species (S1 – S4) present (+) or absent (–) in five different habitats (P, Q, R, S and T). Which species has the maximum diversity? P Q R S T S1 – – – + + S2 + + + + – S3 – – – – + S4 + – + – + A. S1 B. S2 C. S3 D. S4

(v) Phosphorus

35. Refer to the given flow chart and select the incorrect statement.

(i)

Column II Nitrogen

(ii) Chlorine (iii) Iodine

A. B. C. D.

(iii) Anthracite Anthracite Lignite

T.

A. B. C. D.

Combustion of coal and diesel

(iv) Bituminous coal Bituminous coal Lignite

Column II Sulphur dioxide Carbon dioxide Oxygen Sodium bicarbonate + conc. sulphuric acid (v) Carbon monoxide (vi) Phosphorus

(i) (ii) (iii) (iv)

P Q R (iv), (vi) (iii) (i) (v) (iii) (ii), (iv) (ii) (iii), (iv) (v) (vi) (iii) (ii), (iv)

S (ii) (i), (iv) (vi) (v)

T (v) (vi) (i) (i), (ii), (v)

33. Ronit, a class 8 student took 20 mL of dilute HCl in four different flasks. He added 10 mL of pure water to flask I, 20 mL of pure water to flask II, 20 mL of NSO | Class-8 | Set-A | Level 1 |

Q

Pollen grains of a plant are heavier and sticky.

Yes

R

Stigmas are branched and feathery while pollen grains are winged, dry and dusty.  

No

S

No

Anthracite Bituminous coal BitumAnthrLignite inous coal acite

Column I Spontaneous combustion Supporter of combustion Fire extinguisher Incomplete combustion

Yes

Pollen grains are transferred from anther to the stigma of same flower of a plant.

32. Match column I with column II and select the correct option from the given codes. P. Q. R. S.

P

Yes

31. Read the given passage and fill in the blanks by choosing an appropriate option. The process of conversion of wood into coal is called (i) . There are three main varieties of coal which vary in their carbon content. (ii) has upto 96 % of carbon, (iii) has about 65 % of carbon while (iv) has about 38 % of carbon. (ii) Lignite

No

Offsprings show genetic variation.

(iv), Q – (i), R – (ii), S – (v) (ii), Q – (iii), R – (i), S – (iv) (iv), Q – (i), R – (ii), S – (iii) (iii), Q – (iv), R – (v), S – (i)

(i) Destructive distillation Carbonisation Carbonisation Destructive distillation

concentrated HCl to flask III and 30 mL of the same solution of dilute HCl to flask IV. pH of the solution will not change in A. Flask I B. Flask II C. Flask III D. Flask IV.

No

Yes

T

A. In P, bulb like projection called bud may occur on the body of the parent plant. B. Q can help in maintaining pure lines for hybridisation experiments. C. Pollination in R is non-directional while in S and T it is highly specific and directional. D. In T, pollen grains are produced in large numbers while in Q they are fewer. 36. Refer to the given food web in an aquatic ecosystem. In which of the following species Q would a toxic pollutant present in water body probably reach the P S R highest concentration. [The arrows represent energy flow and the letters T represent different species.] A. S B. Q C. R D. T 37. Refer to the given Venn diagram Y and select the incorrect statement Streamlined body Wings regarding animals X, Y and Z. X A. Both X and Z can regulate Z their body temperatures Breathe but X is oviparous and Z through lungs is viviparous. B. Y may have an exoskeleton of scales and its body is divisible into head, trunk and tail. C. X could be stork, Y could be arowana and Z could be dolphin. D. X has hollow bones and Y respires through moist skin and buccopharyngeal cavity. 5

38. Refer to the given dichotomous key and select the correct statement. (i) (a) Single parent is involved in reproduction.-Go to (ii) (b) Two parents are involved in reproduction.-Go to (iii) (ii) (a) The nucleus of the parent body divides only once. - P (b) The nucleus of the parent body divides repeatedly. - Q (iii) (a)  Fertilisation occurs outside parent body. - R (b)  Fertilisation occurs inside parent body. - Go to (iv) (iv) (a) Embryonic development occurs outside parent body. - S (b) Embryonic development occurs inside parent body. - T

41. Study the given diagram of human heart and select the correct statement regarding its parts labelled X, Y and Z. X A. All systemic arteries arise from Y. Y B. Z transports oxygenated blood Z from lungs to the left atrium. C. Y carries oxygenated blood from lungs to right atrium. D. X carries deoxygenated blood from left atrium to lungs.

A. P occurs in Plasmodium while Q occurs in Amoeba. B. In S, both the types of gametes are released from the body while in T, only one type of gamete is released from the body. C. R involves only mitosis while S involves both mitosis and meiosis. D. In S, eggs are surrounded by protective calcareous shell while in T protective calcareous shell is absent around the eggs.

Distilled water

39. Read the following statements and select the correct option. Statement 1: Pheromones are used as biological method to control pest. Statement 2: Pheromones lure adult male insects into special traps and prevent them from breeding. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Both statements 1 and 2 are false. 40. Refer to the given flow chart and select the incorrect statement regarding P, Q, R and S. Gaseous pollutant

No

P

No

Causes acid rain Yes

S

Yes

Q

No

Combines with blood and prevents it from carrying oxygen

Yes

R

A. P could be particles of carbon which enter human lungs. B. Excessive Q in atmosphere traps large amount of Sun's heat and increases the Earth's temperature. C. S reacts with water present in the atmosphere to form sulphuric acid. D. Catalytic converter converts Q and S into gas R. 6

Boiling tubes Visking tubing P

Visking tubing Q

3 cm3 each of glucose solution and distilled water







3 cm3 each of starch solution and digestive juice from pancreas

A. Both glucose and starch are able to diffuse through the Visking tubings into the boiling tubes. B. Exosmosis of water from Visking tubing Q will take place only after conversion of starch into glucose by digestive enzyme. C. Initially only the contents of Visking tubing Q will give positive iodine test but after 30 minutes the contents of both Visking tubings will give positive iodine test. D. None of these

43. What is the major difference between a human skin cell and a human egg cell? A. The egg cell has twice as many chromosomes as the skin cell. B. The egg cell has half as many chromosomes as the skin cell. C. The skin cell has no genetic information in its chromosomes. D. Only the egg cell has a nucleus. 44. Refer to the given table. Identify X, Y and Z and select the correct statement.

Yes

Causes green house effect

42. Study the given experimental set up and select the correct option regarding it.

Fibres X Y Z

Source Plant Animal Artificial

Absorption of water Moderate High Minimum

A. X is more suitable for summer clothing while Y is more suitable for winter clothing. B. X is jute, Y is silk and Z is linen. C. X on burning gives odour of burning hair whereas Y on burning gives odour of charred meat. D. Both A and B | NSO | Class-8 | Set-A | Level 1

45. Refer to the given figures P, Q, R and S and select the correct statement regarding them.

P

Q

R

S

A. Q and R show holozoic heterotrophic nutrition whereas P shows mixotrophic nutrition. B. S is helpful in crop growth and increases capacity of soil to hold water. C. P and S use pseudopodia for feeding and locomotion. D. In Q, cilia help in locomotion and catching prey while in R flagella help in locomotion.

ACHIEVERS SECTION Direction (Q. No. 46 and 47): Read the given passage and select the correct option for the following questions. The sound returning back towards the source after suffering reflection from a distant obstacle like wall, hill etc. is called an echo. A cracker is fired by a child. The child hears an echo from a cliff 4 seconds after the sound produced by a cracker. The speed of sound in air at 20°C is 344 m s–1. 46. What is the minimum distance between the observer and the obstacle for echo to be heard? A. 17.2 m C. 14.2 m

B. 15.2 m D. 34.4 m

A. Insulin should be replaced by aldosterone. B. Liver should not be replaced as it is correctly mentioned. C. Positions of pineal and thyroid should be interchanged. D. Adrenaline should be replaced by progesterone.

47. How far is the cliff from the child? A. 344 m C. 200 m

B. 688 m D. 300 m

48. Refer to the given graph Crop field X representing two crop fields X and Y that have been treated Crop field Y by different types of materials for nutrient replenishment, Time keeping other environmental factors same. Select the incorrect statements regarding these crop fields X and Y. A. Materials used for treating crop field X could be organic substances while those used for Y could be inorganic substances. B. Materials used for crop field X are nutrient specific while those used for crop field Y are not nutrient specific. C. Gradual decline in yield of crop field Y is due to killing of useful soil microbes. D. Persistent yield of crop field X is due to replenishment of nutrients by gradual decomposition of organic matter. % of crop yield

49. Refer to the given paragraph where few words have been italicised. Hormones are produced by organs called endocrine glands. These are ductless glands. Very small quantity of different hormones is required by our body. Adrenaline is secreted when we are stressed or excited. Liver regulates the sugar metabolism in the body by its hormone insulin. Pineal glands secrete calcitonin while thyroid glands secrete melatonin. Select the correct option regarding these.

50. Ms Deepika conducted a few experiments to explain the properties of metals and non-metals. She set up the experiments as shown in the given figure. Na

Cold water

Cold water (i)

Zn

Mg

(ii)

HCl (dil.) (iii) Cu

Sulphur

HCl (dil.)

HCl (dil.) (iv)

(v)

She noted her observations as : I. No reaction will take place in beakers (iv) and (v). II. H2 gas will be evolved in beakers (i), (ii) and (iii). III. A vigorous reaction will take place in beaker (i) while no reaction will occur in beaker (ii). IV. Two different gases will be evolved in beaker (iv). The correct observations are A. II, III, and IV only B. II and IV only C. I and III only D. II and III only.

SPACE FOR ROUGH WORK

NSO | Class-8 | Set-A | Level 1 |

7

Class 8

Set B Year 2017

LOGICAL REASONING 1.

Find the odd one out.



A.

2.

Three positions of a dice are shown. When 3 is at the bottom, which number will be on the top? A. 4 5 4 6 B. 2 2 6 1 1 4 3 C. 5 D. 6

3.

4.

B.

7. C.

D.

All the letters which occur at odd places in the word EXCITEMENT are placed at odd places such as first letter is placed at third place, third letter at fifth place and so on. Similarly, the letters at even places are placed. Last two letters i.e., letter at odd place is placed at first place and letter at even place is placed at second place. Now, which of the following letters will be seventh from the right end in the new arrangement? A. T B. E C. X D. M Which of the following figures will complete the pattern given in Fig. (X)?

? Fig. (X)

A. 5.



B.

C.

D.

If P $ Q means P is the father of Q, P # Q means P is the mother of Q and P * Q means P is the sister of Q, then N # L $ P * Q shows Q is ______ of N. A. Nephew B. Grandson C. Granddaughter D. Data inadequate

6.

Find the water image of given combination of letters/ numbers/symbols. N56#38AB$& N56#38AB$& B. &$BA83#65N A. C. D.

Which of the following Venn diagrams best depicts the relationship amongst, "Paddy, Wheat and Rabi-Crop"?

A.

B.

C.

D.

8.

Which of the following indicates similar relationship as 'NORMAL' has with 'LMPOCN'? A. RESCUE : PCQAWG B. BRANCH : DTCLAF C. NATION : LYRGMK D. FRIEND : DPGGPF 9.



Group the given figures into three classes on the basis of their identical properties using each figure only once. A. 1, 2, 3; 5, 7, 8; 4, 6, 9 B. 1, 2, 5; 3, 7, 8; 4, 6, 9 C. 1, 2, 6; 3, 5, 7; 4, 8, 9 D. 1, 3, 5; 2, 7, 9; 4, 6, 8

10. Two rows of numbers are given. The resultant number in each row is to be worked out separately based on the following rules and the question below the rows of numbers is to be answered. The operations on numbers progress from left to right. Rules: (i) If an odd number is followed by a two digit even number, then they are to be added. (ii) If an odd number is followed by a two digit odd number, then the first number is to be subtracted from the second number. (iii) If an even number is followed by a number which is a perfect square of a number, then the second number is to be divided by the first number. (iv) If an even number is followed by a two digit even number, then the first number is to be multiplied by the second number. 4   12   144 18    45 7   What is the product of the resultant numbers of both the rows? A. 60 B. 80 C. 40 D. 90

SCIENCE 11. The given diagrams show three different circuits. In each circuit, similar batteries and bulbs of the same wattage are used. When the electric circuits are connected, all the bulbs light up. 1

2

2

3



Which of the following options is true about the bulbs 1, 2 and 3? Bright Brighter Brightest A. 1 2 3 B. 3 2 1 C. 2 3 1 D. 2 1 3 | NSO | Class-8 | Set-B | Level 1

12. Read the given statements and select the correct option. Statement 1 : When deep-sea fish are brought to the surface of the sea, their bodies burst. Statement 2 : Blood in the blood vessels of the deep-sea fish flows at very high pressure. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Statement 1 is false but statement 2 is true. 13. T h e g i v e n g r a p h shows the change in temperature of water with time as it is brought to boil before being left to cool. Time (minutes) Based on the graph, which of the following statements are correct? (i) Evaporation only occurs from P to Q. (ii) There is heat gain from P to R. (iii) The water is boiled for 6 minutes. (iv) Water exists in two different states between Q and R. A. (i) and (ii) only B. (ii) and (iv) only C. (i) and (iii) only D. (ii), (iii) and (iv) only 14. A sound is played on a flute. A sound of same pitch is played on a trumpet. Which of the following correctly compares the two sound waves? Frequency Speed A. Different Different B. Different Same C. Same Different D. Same Same 15.

The ray from a laser pointer hits a plane mirror and the reflected ray strikes a screen. How far away from point X should the ray strike the mirror to cause the reflected ray to hit point R? A. 6 cm C. 16 cm

Laser pointer Screen 8 cm X

R Mirror

4 cm

24 cm

B. 12 cm D. 18 cm

16. Read the given statements and select the correct option. (i) Lightning bolt occurs because air is a good conductor of electricity. (ii) During lightning it is safe to take shelter under a tree. (iii) When a comb is run through dry hair, the comb acquires a negative charge. (iv) When a glass rod is rubbed with silk cloth, glass rod acquires positive charge. NSO | Class-8 | Set-B | Level 1 |

A. (i) and (ii) only C. (iii) and (iv) only

B. (ii) and (iii) only D. (i) and (iv) only

17. Study the displacementtime graph of a toy car given here and choose the correct statement(s) from the following. A. T h e t o y c a r i s slowest during first 10 seconds. B. The toy car is slowest in between 10 to 20 seconds. C. The toy car is fastest during first 10 seconds. D. Both B and C. 18. A 100 N uniform rod of length 6L is supported by two forces F1 and F2 as shown here. What is the ratio for F1 to F2? Rod A. 2 : 1 B. 1 : 2 2L L C. 3 : 1 F2 F1 D. 1 : 3 19. Which of the following is an incorrect match? Planet Time to orbit Time for one the sun rotation on its axis A. Jupiter 12 years 9 h 55 m B. Mars 687 days 24 h 37 m C. Venus 225 days 243 days D. Neptune 265 years 10 h 7 m 20. Which of the following statements is/are true? (i) Rainbow is formed by the refraction of sunlight by tiny droplets of water suspended in the air. (ii) Apparent bending of a pencil half dipped in water is because of refraction. (iii) When light ray enters from air to water, it bends towards the normal. (iv) When two refracting surfaces of the glass slab is kept parallel to each other, the emerging light ray will be parallel to the incident ray. A. (i) only B. (ii) and (iii) only C. (ii), (iii) and (iv) only D. (iv) only 21. The diagram shows an isolated sphere X with its charge distribution. Another similar uncharged earthed sphere Y is brought near sphere X. Which of the following diagrams shows the final charge distribution on both spheres? – – X – A. – –

–

–

X – C. –

–

– – –

+ + + +

– – – + – –

Y

+ Y

– – – – – B. – –

– + +

– X –

– – –

+ – – + – +

–

– – –

X –

+

+

Y

+ +

D. None of these

3

Distance (cm)

22. A ball rolled on four wooden surfaces of different roughness P when a similar push was applied Q on it. The graph shows the distance R S travelled by the ball on the surfaces over time. Time (minute) Which of the following conclusion is/are correct? (i) Different magnitudes of the friction were produced when the ball was rolling on different wooden surfaces. (ii) Surface Q is rougher than surface R. (iii) Surface S has the least roughness. A. (i) only B. (ii) only C. (iii) only D. (i) and (iii) only 23. Read the following passage and select the option which correctly fills the blanks. If a metal wire is connected through a battery then the conventional current in the wire flows from (i) terminal to (ii) terminal of the battery while the electronic current flows from (iii) terminal to (iv) terminal of the battery. (i) (ii) (iii) (iv) A. Positive Positive Negative Positive B. Positive Negative Negative Positive C. Negative Positive Negative Positive D. Negative Negative Positive Negative 24. In an experiment to determine the speed of sound, a student stands 150 m from a wall and claps. When he claps once, what is the time interval between the sound of the clap and its echo heard by the student, in terms of v, the speed of sound? 150 m 300 m 335 m 200 m A. B. C. D. v v v v 25. The artificial satellites sent into space by India in ascending order of their launching dates are A. APPLE, EDUSAT, ROHINI, INSAT 4B B. EDUSAT, ROHINI, APPLE, INSAT 4B C. ROHINI, APPLE, EDUSAT, INSAT 4B D. INSAT 4B, EDUSAT, APPLE, ROHINI. 26. Read the given passage and fill in the blanks by choosing an appropriate option. Metals have high densities except (i) which can even float on water. Metals are malleable and ductile. (ii) are the most malleable and ductile metals. All metals conduct heat and electricity. (iii) is the best conductor while (iv) is a poor conductor. (i) (ii) (iii) (iv) A. K and Ca Fe and Cu Al Ag B. Cu and Pb Cu and Al Cu Au C. Na and K Au and Ag Ag Hg D. Na and Mg Zn and Cu Zn Na

A. Solution X is soap solution and solution Y is vinegar. B. Solution X is nitric acid and solution Y is baking soda. C. Solution X is carbonic acid and solution Y is sugar solution. D. None of these 28.

A brief information about a few substances is given as : X : It is the residue left behind after destructive distillation of coal. Y : It is a mixture of hydrogen, methane, carbon monoxide and other gases. Z : It contains several carbon compounds which are used to make pesticides, explosives, synthetic fibres, perfumes, etc. X, Y and Z are respectively A. Kerosene, CNG and ammoniacal liquor B. Bitumen, coal gas and coal tar C. Coke, coal gas and coal tar D. Petrol, CNG and bitumen. 29. A science teacher has arranged a few test tubes as :

Which of the following statements is incorrect about the given experimental set-up? A. Turmeric solution turns red in test tubes 1 and 3. B. China rose indicator turns green in test tubes 2 and 4. C. Methyl orange turns yellow in test tubes 1 and 3. D. Phenolphthalein remains colourless in test tubes 2 and 4. 30. Four experimental set-ups are shown in the given figure.

27. Observe the given experimental set-up carefully and choose the correct statement. 4

| NSO | Class-8 | Set-B | Level 1

No reaction will take place in beaker(s) A. II only B. I and IV only C. I and II only D. III and IV only. 31. Study the given Venn diagram carefully and identify points 1, 2 and 3. Chemical 1 Physical change change 2 3

(ii) Synthesising lipids (iii) Packaging of materials synthesised in cell (iv) Secreting digestive enzymes P Q R S A. (ii) (iv) (iii) (i) B. (ii) (iii) (i) (iv) C. (ii) (iii) (iv) (i) D. (i) (iii) (iv) (ii) 35. Refer to the given flow chart and select the correct statement regarding P, Q, R, S and T.

Slow change

It is a natural fibre.

No

P

Yes

1 A. Burning of a kerosene wick stove B. Setting of milk to form curd C. Burning of LPG in kitchen D. Burning of a candle

2 3 Tarnishing of Bursting silver jewellery of balloon Extraction of metals by electrolysis Rusting of iron Breaking of glass

It is obtained from plants.

W X Y Z

Absorbs moisture, can be woven like silk fibres Soft like wool, less expensive and does not shrink Strong, long lasting, water and wrinkle-resistant Elastic, very strong, light and wrinkle-resistant

R

Yes

Slaking of lime

The source organism is harmed in fibre obtaining process.

No

S

Yes

Evaporation of water Depletion of ozone layer

Used for making Reinforced tyres, bandages Blankets, shawls Dress material, soft drink bottles Socks, fishing nets

33. Which of the following statements are correct? I. Yellow flames are ideal for heating. II. The substances which vaporise during burning give flames. III. Luminous zone contains unburnt carbon particles. IV. The non-luminous zone has the highest temperature. A. I, II and III only B. II and IV only C. II, III and IV only D. I, III and IV only

NSO | Class-8 | Set-B | Level 1 |

No

It is obtained from animals.

W, X, Y and Z are respectively A. Rayon, acrylic, polyester and nylon B. Wool, cotton, nylon and acrylic C. Polyester, cotton, nylon and rayon D. Acrylic, polyester, cotton and nylon.

34. Refer to the given ultrastructure of an animal cell. Identify the labelled parts (P–S), match them with their functions and select the correct option. (i) Synthesising proteins from amino acids

Q

No

32. Shreya, a class 8 student listed the properties and uses of a few fibres in the given table. Fibre Properties

Yes

S

T

(i) Q is cellulosic whereas S is proteinaceous in nature. (ii) S could be obtained from a viviparous animal whereas T could be obtained from an oviparous animal with four stages in its life cycle. (iii) P and S are non-biodegradable fibres. (iv) P and R are petroleum based fibres. (v) Organisms providing S generally inhabit desert lands whereas those providing Q generally inhabit polar regions. A. (i), (ii) and (iii) only B. (i) and (ii) only C. (i), (iv) and (v) only D. (i), (ii), (iv) and (v) only 36. Refer to the given Venn diagram. Digestion Digestion Identify the food components X in in mouth stomach and Y, and select the incorrect X Y statement regarding them. Digestion A. Excess of X could be in small intestine stored in the cells of liver. B. Pancreas secretes digestive juices which acts on Y only. C. Y could be a food component required for body building and repair of damaged tissues or a food component that cannot be digested properly in the body if liver stops manufacturing bile. D. Products of digestion of Y could be glycerol and fatty acids. 37. Refer to the given figure. Identify P – S and select the correct statements regarding them. (i) If both P are surgically removed from a female's body then she will not menstruate but can still produce eggs. (ii) R is a very small organ in a female which serves as a site of formation, implantation and further development of zygote. 5

(iii) When embryo implants and develops in Q, it is removed by medication or invasive surgical procedures as it could be life threatening for mother. (iv) Labelled part S receives sperms and also serves as birth canal. A. (iii) and (iv) only B. (i) and (iv) only C. (i) and (ii) only D. (i), (ii) and (iv) only 38. Refer to the given schematic representation of circulation in humans. Identify X, Y and Z X Y and select the correct statement regarding them. Z A. In the absence of Z in body, nutrient uptake by body cells will remain unaffected but elimination of waste from body cells will not take place. B. Y has no valves while X has valves to prevent backward flow of blood. C. X is vena cava that carries deoxygenated blood from body parts to the left atrium of heart. D. Through Y, the medicines reach the heart from where they are pumped all over the body. 39. Which of the following statements are correct? (i) Water logging increases the amount of salt in the soil that reduces soil fertility. (ii) 2, 4-D, MCPA and butachlor are common weedicides. (iii) Leguminous crops (like pea and beans) cannot be grouped in combination with cereals (like wheat and rice) under mixed cropping as both use large amount of nitrogen from the soil. (iv) Manures provide specific nutrients to the soil. (v) Paddy, maize, cotton and groundnut are examples of kharif crops while wheat, gram, pea and mustard are examples of rabi crops. A. (i), (iv) and (v) only B. (ii), (iii), (iv) and (v) only C. (i), (ii) and (v) only D. (i), (ii), (iii) and (iv) only 40. Rectify the given statements by replacing the underlined words and select the correct option. (i) The viscous fluid present in the nucleus is called cytoplasm. (ii) Vacuoles are rod shaped structures which oxidise food to provide energy. (iii) Mitochondria contain green pigment chlorophyll and take part in photosynthesis. (iv) Lysosomes take part in synthesis of proteins. A. (i)-Nucleoplasm, (ii)-Lysosomes, (iii)-Plastids, (iv)-Centrosomes B. (i)-Protoplasm, (ii)-Ribosomes, (iii)-Centrosomes, (iv)-Golgi bodies C. (i)-Nucleoplasm, (ii)-Mitochondria, (iii)-Chloroplasts, (iv)-Ribosomes D. (i)-Protoplasm, (ii)-Plastids, (iii)-Chloroplasts, (iv)-Ribosomes 6

41. Refer to the given food web and select the correct statement regarding it. (i) N could be a herbivore whereas O could be an omnivore. (ii) Stability of this food web will be affected if entire population of organism L is removed from the community where this food web is functional. (iii) K is a saprophyte which plays an important role in recycling of nutrients. (iv) There are eight interconnected food chains in the given food web. (v) N serves as secondary as well as tertiary consumer in the given food web. A. (i) and (ii) only B. (ii), (iv) and (v) only C. (i), (ii), (iii) and (iv) only D. (i) and (iii) only 42. Refer to the given list of fruits/seeds. (i) Hiptage (ii) Acer (iii) Xanthium (iv) Urena (v) Coconut (vi) Dandelion (vii) Lotus (viii) Balsam (ix) Pea (x) Guava Select the option which correctly matches these fruits/seeds with their dispersal agents, wind (P), water (Q), animals (R) and explosion (S). P

A. B. C. D.

Q

R

S

(i), (ix), (v) (vii), (viii) (iii), (iv), (x) (ii), (vi) (i), (ii), (ix) (v), (vii) (i), (iii), (viii) (v), (vii) (i), (ii), (vi) (v), (vii)

(iii), (iv), (x) (vi), (viii) (ii), (iv), (x) (vi), (ix) (iii), (iv), (x) (viii), (ix)

43. Select the pair of diseases that are caused by contaminated water. A. Cholera and typhoid B. Diarrhoea and common cold C. Pneumonia and typhoid D. Malaria and pneumonia 44. Read the given paragraph and select the correct option regarding P, Q, R and S. According to Red list of International Union for Conservation of Nature (IUCN), P is an extinct animal, Q is an endangered animal, R is a vulnerable animal whereas S is a critically endangered animal.   P   Q  R  S A. Olive ridley Passenger Asian Giant turtle pigeon elephant panda B. Passenger Golden Giant Silvery pigeon langur panda pigeon C. Dodo Indian Sloth Blue rhinoceros bear whale D. Silvery Chinkara Desert Two pigeon kangaroo banded rat chameleon | NSO | Class-8 | Set-B | Level 1

45. The period of crop harvesting is celebrated with great joy and happiness in all parts of India. Special festivals are associated with the harvest season. Which among the following group of festivals is associated with harvest season?

A. B. C. D.

Pongal, Holi, Diwali, Nabanna Diwali, Christmas, Eid, Pongal Pongal, Eid, Holi, Nabanna Pongal, Baisakhi, Eid, Nabanna

ACHIEVERS SECTION P Q R S

25° Y

Drawn to scale

X

46. At which point should the eye be placed so that the reflected ray from the mirror X can be seen? A. P B. Q C. R D. S 47. If you place a sufficiently long mirror Z perpendicular to mirror X then the angle of reflection for the ray reflected from mirror Z will be A. 25° C. 65°

B. 45° D. 115°

I. (a) It is unicellular organism. – Go to II (b) It is multicellular organism. – Go to IV II. (a) It possesses well organised nucleus. – Go to III (b) It lacks well organised nucleus. – P III. (a) Nutrition is parasitic. – Q (b) Nutrition is mixotrophic. – R IV. (a) It possesses chlorophyll. – S (b) It lacks chlorophyll. – T A. P can convert lactose sugar of milk into lactic acid. B. R could be Euglena which possesses cilia that helps in movement. C. Q could be Plasmodium which causes malaria or it could be Entamoeba which causes amoebic dysentery in humans. D. S could be a plant like pondweed whereas T could be a scavenger like vulture or a decomposer like Rhizopus. 50. Refer to the given graph representing the blood glucose concentration of two persons X and Y after eating a meal. [Note : Both persons X and Y are not under any medication.]

48. The given figure represents a fractionating column used in refineries. Which of the following statements are correct? I. Substance U has the highest boiling point among all the fractions while substance Z has the lowest boiling point. II. Substance U is used as a domestic fuel while substance Z is used for lubrication. III. U, V, W and X all are used as fuels. IV. V is used in power stations while X is used as a fuel for lamps and stoves. A. I and IV only B. II and III only C. I, III and IV only D. I, II, III and IV 49. Refer to the given dichotomous key. Identify P –T and select the incorrect statement.

Blood glucose concentration (mg/dL)

Direction (Q. No. 46 and 47): Refer to the given passage and answer the following questions. The given figure shows a plane mirror X placed in front of a torch. A small cardboard piece Y with a hole is illuminated by the torch as shown in the figure.

200 180 160 140 120 100 80

X

Y 1

3 2 4 Time(Hour)

5

Select the incorrect statement(s) regarding blood glucose concentration in both the persons X and Y. (i) Both persons X and Y had insulin released into their blood stream by their pancreas after the meal. (ii) Person X is healthy individual while person Y can be hypoglycemic. (iii) Lowering of blood glucose level in X is brought about by utilisation of glucose in respiration and excretion through urine. A. (ii) and (iii) only B. (i) only C. (i) and (iii) only D. (i) and (ii) only

SPACE FOR ROUGH WORK

NSO | Class-8 | Set-B | Level 1 |

7

Class 8

Set A Year 2018

LOGICAL REASONING 1.

Select a figure from the options which will continue the series as established by the Problem Figures. Problem Figures

F A. U



B.

C.



D.

2. 3. 4. 5.

Count the number of triangles in the given figure. A. 43 B. 46 C. 42 D. None of these Find the missing number, if same rule is followed in all the three figures. A. 35 25 30 ? B. 25 C. 28 15 20 18 24 21 28 D. 30 Select the correct water image of the given figure.

B.

C.



D.

6.

How many 8’s are there in the given series, which are immediately preceded by a number which does not divide it but followed by a number which divides it? 48282838588532823847158382 86886 A. 1 B. 2 C. 3 D. 4 8.

If in a certain code language, ACNE is coded as 3 5 16 7, then how will PAIR be coded in the same language? A. 18 3 11 20 B. 18 3 11 25 C. 13 4 11 18 D. 15 4 19 27

A.

7.



Which of the following interchanges in signs makes the given statement true? 5 × 15 ÷ 7 – 20 + 4 = 77 A. – and + B. + and × C. ÷ and + D. ÷ and ×

There is a certain relationship between the figures (i) and (ii). Establish the same relationship between figures (iii) and (iv) by selecting a suitable figure from the given options which will replace the (?) in fig. (iv).

A.



B.

C.



D.

9.

In the question below, two statements followed by two conclusions numbered I and II are given. You have to take the two given statements to be true even if they seem to be at variance of commonly known facts and decide which of the conclusion(s) logically follow(s) from the two given statements, disregarding commonly known facts.



Statements : Some books are papers. Some papers are notebooks. Conclusions : I. Some papers are books. II. Some notebooks are papers. A. Only conclusion I follows B. Only conclusion II follows C. Neither I nor II follows D. Both I and II follow

10. Select a figure from the options which will complete the given figure. A.

B.

C.

D.



?

SCIENCE 11. Which of the following statements is/are always true regarding a converging lens? I. When the object is placed nearer to the focal point, the image gets bigger. 2



II. When the object is placed away from the lens, image gets smaller. III. When the object is placed very far away from the lens, the image distance approaches focal length. | NSO | Class-8 | Set-A | Level 1



A. I and II only C. I and III only

B. II and III only D. II only

12. Which sound wave shown here is high-pitched but soft? A.



B.

C.



D.

8 cm

20 cm

14 cm

14. Different weights P, Q and R were hung on a spring as shown in the figure. 17 cm

22 cm

P Q

P R

P Q R



Which of the following represents the length of the spring when only weight P is hung on the spring? A. 7 cm B. 10 cm C. 17 cm D. 22 cm

15. Which one of the following is a right arrangement?

A. B. C. D.

Rolling friction > static friction > sliding friction Sliding friction < static friction < rolling friction Rolling friction > static friction < sliding friction Static friction > sliding friction > rolling friction

16. The force that is responsible for revolution of the earth around the sun is A. Electric force B. Magnetic force C. Electromagnetic force D. Gravitational force. 17. In an experiment to measure the speed of sound in air, a boy stands 40 m away from a wall and bangs two pieces of wood together. At the instant he hears the echo, he bangs them together again. He does this activity 50 times. The time taken for 50 bangs is 12 s. Which calculation gives the speed of sound in air? NSO | Class-8 | Set-A | Level 1 |

B.

40 × 50 12

40 × 2 × 50 C. 12

D.

40 × 2 × 12 50

18. A student performed experiments taking similar bulbs and cells, but two different solutions I and II as shown in the figure.

13. The diagram shows the water levels Gas G in a water manometer which is used to measure the pressure of gas G in cm of water. (Figure Water is not drawn to the scale.) What is the pressure of gas G? A. 6 cm of water more than the atmospheric pressure B. 8 cm of water more than the atmospheric pressure C. 6 cm of water less than the atmospheric pressure D. 8 cm of water less than the atmospheric pressure

15 cm

12 A. 40 × 50

Solution I

(P)

(Q)

Solution II



She found that the bulb in the set-up P glows more brightly as compared to that of the set-up Q. You would conclude that



A. Higher current is flowing through the circuit in set-up P as compared to set-up Q B. Higher current is flowing through the circuit in set-up Q as compared to set-up P C. Equal current is flowing through both the circuits. D. The current flowing through the circuits in the two set-ups cannot be compared in this manner.



19. A plane mirror forms a virtual image. The distance between Mahima and her image in a plane mirror is 10 m. How much distance should she move in order to get the distance of 5 m between herself and her image?

A. B. C. D.

2.5 m away from the mirror 2.5 m towards the mirror 5 m away from the mirror 5 m towards the mirror

20. Read the given statements and select the correct option. Statement 1 : When an object is placed between two plane parallel mirrors, then all the images formed are of unequal intensity. Statement 2 : In case of plane parallel mirrors, only two images are possible.

A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Both statements 1 and 2 are false.

21. Which coil produces the strongest electromagnet for a given flow of current?

A. B. C. D.

A 10 cm coil with 100 turns A 5 cm coil with 200 turns A 10 cm coil with 200 turns A 20 cm coil with 200 turns 3

22. According to the given speed- v time (v-t) graph, what happens to the distance covered by the car from 0-10 minutes? A. It goes on increasing. B. It goes on decreasing. 0 5 C. It first increases and then decreases. D. It first decreases and then increases.

Graph of car moving on a straight road t (min) 10

23. Neha conducted an experiment as shown in the diagram. 20



III. Natural gas is a cleaner fuel, on burning it does not produce any ash or smoke. IV. Natural gas is an exhaustible source of energy like fossil fuels. The correct statements are A. I and III only B. II and III only C. I and IV only D. I, III and IV only.

27. Rishab has arranged the following set-ups to study the process of rusting.

NaCl (aq.)

Nickel coin

Iron nail

Paper

She placed a nickel coin on a piece of paper and heated them over a Scorched area flame. After one minute, she observed that some parts of the paper was scorched as shown in the diagram here. She repeated the experiment with a glass coin placed on the paper. Which of the following best represents the possible outcome of the experiment?



A.



B.

Scorched area

(i)



(ii)

Water Iron nail Aluminium coil

Cotton wool Iron nail Anhydrous calcium (iii) chloride (iv)

Water Iron nail Copper

Iron nail will rust in test tubes A. (ii) and (iii) only B. (i) and (ii) only C. (iii) and (iv) only D. (i) and (iv) only.

28. Which of the following statements is incorrect? A. Gold and silver are the most malleable and ductile metals. B. All metals are hard and strong. C. Mercury and gallium are metals which exist in liquid state at room temperature. D. Most of the metals have high specific gravities. 29. Match the following columns for the flame of a candle.

C.



Column I (Part) P. Hottest part

D.

24. While drinking a soft drink with the help of a straw, the pressure in the straw is _______ and the pressure in the bottle is _______. A. High, less B. High, high C. Less, less D. Less, high 25. Match column I with column II and select the correct option from the given codes. Column I Column II P. When a body changes (i) Non-uniform motion its position with time Q. Interval between two (ii) Motion events R. SI unit of speed (iii) Time S. Unequal distance in (iv) metre per second equal interval of time A. P - (iii), Q - (iv), R - (i), S - (ii) B. P - (iii), Q - (i), R - (ii), S - (iv) C. P - (ii), Q - (iii), R - (iv), S - (i) D. P - (ii), Q - (iv), R - (iii), S - (i) 26. Consider the following statements : I. Natural gas can be supplied to homes and factories through pipes. II. Natural gas is obtained by fractional distillation of petroleum. 4



Column II (Zone) (i) Innermost zone of unburnt wax vapours (ii) Middle zone of Q. Moderately hot part partial combustion R. Least hot part (iii) Outermost zone of complete combustion A. P-(iii), (y); Q-(i), (z); R-(ii), (x) B. P-(ii), (x); Q-(iii), (y); R-(i), (z) C. P-(iii), (x); Q-(ii), (z); R-(i), (y) D. P-(i), (z); Q-(iii), (x); R-(ii), (y)

Column III (Colour) (x) Blue (y) Black (z) Yellow

30. Following statements are given by four students : Rashmi : Sodium chloride is an acidic salt whereas washing soda is a basic salt. Akshi : The aqueous solution of sugar does not change the colour of either red litmus solution or blue litmus solution. Reema : Tamarind tastes sour whereas baking soda is bitter in taste. Shristi : Apple juice does not change the colour of red litmus solution. The incorrect statement(s) is/are given by A. Reema and Shristi only B. Rashmi only C. Akshi and Reema only D. Akshi and Shristi only. | NSO | Class-8 | Set-A | Level 1

31. Read the given statements and select the correct option. Statement 1 : Bakelite is used for making electric switches and plugs. Statement 2 : It is a thermosetting polymer and an insulator. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true but statement 2 is false. D. Both statements 1 and 2 are false. 32.

Find the incorrect match. CuS + H2SO4 A. CuSO4 + H2S – Double displacement reaction B. C + 2S CS2 – Endothermic reaction C. NH4OH + HCl NH4Cl + H2O – Neutralisation reaction D. Cl2 + H2 2HCl – Hydrogen is acting as an oxidising agent

33. Which of the following statements is/are incorrect? I. Perspex is thermoplastic which is transparent like glass but is much stronger. II. Nylon thread cannot support more weight as compared to steel wire of same dimensions. III. Polyester and nylon on burning give smell of burning hair. IV. Terylene, a synthetic fibre, can be used instead of wool. A. II, III and IV only B. II and IV only C. I only D. I, II, III and IV 34. Given below is a list of few chemicals that are used for protection of crops. (i) Dalapon (ii) Butachlor (iii) Malathion (iv) Simazine (v) Disyston (vi) Gammexane



Which of the given differences are incorrect? (i)

(ii) (iii)

(iv) (v)

Manures They are not easily soluble in water. So they are not eas ily absorbed by the roots of the plants. These are inorganic substances. Excessive use does not harm the soil texture, they provide humus to the soil. They restore the soil texture and help in water retention. These are nutrient specific.

A. (ii) and (v) only C. (iii) and (iv) only

Fertilisers They are soluble in water and are absorbed by the plants easily. These are organic substances. Excessive use can change the chemical composition of the soil and also pollutes water. They may damage the soil texture. These are not nutrient specific.

B. (i), (ii) and (v) only D. (i), (iii) and (v) only

37. Identify the parts of female reproductive system from the given statements and select the correct option. P : It receives sperms. Q : Here zygote develops into a baby. R : Ovum gets fertilised here. S : It produces female gamete. P Q R S Oviduct Ovary A. Vagina Uterus B. Uterus Vagina Oviduct Ovary C. Uterus Oviduct Ovary Vagina D. Vagina Oviduct Uterus Ovary 38. Refer to the given figure and select the incorrect statement regarding labelled parts W, X, Y and Z. W

How many of these are used as insecticides? A. 3 B. 4 C. 2 D. 5

X

35. Refer to the given figures and select the incorrect statement regarding them.

Y Z

L M N O A. L could be Pseudomonas that helps in biodegradation of organic pollutants. B. M could be Vibrio cholerae that causes cholera in human beings. C. N could be Treponema pallidum that causes syphilis in human beings. D. O could be Lactobacillus that helps in curdling of milk. 36. Following are the differences between manures and fertilisers. NSO | Class-8 | Set-A | Level 1 |







A. Deficiency of hormone released by W could result in retarded growth of the body. B. Deficiency of hormone released by X during childhood could cause mental impairment and reduced growth whereas in adults it leads to reduced metabolism. C. Deficiency of hormone released by Y could negatively affect development of gametes and differentiation of secondary sexual characters in males and females. D. Deficiency of hormone released by Z may cause a rise in blood sugar level leading to a condition called diabetes mellitus. 5

42. Identify W, X and Y in the given figure and select the incorrect option regarding them. W

X

Black box

An aquatic plant a

b

A. X could be a gas that causes global warming. B. Y could be a gas that is fixed in carbohydrate by plants during photosynthesis. C. X could be a gas that is used in fire extinguishers. Y could be a gas that is present in largest proportion D. in atmospheric air. 44. Refer to the given figures showing seeds/fruits of three different plants.





X

6

Y

Z

Select the option which contains plants that can replace X, Y and Z, respectively based on the mode of dispersal of their seeds. X Y Z A. Lotus Beans Calotropis B. Castor Coconut Acer C. Dandelion Balsam Urena D. Mango Cotton Maize

45. Which of the following graphs shows the likely relationship between the percentage of pollution to the population of people in a particular town? B.

A. Population of people

C. Y

Water

Water

% of pollution

X

Y

% of pollution

41. Match column I with column II and select the correct option from the given codes. (There can be more than one match for column I.) Column I Column II (a) Green algae (i) Gelidium (b) Red algae (ii) Chlamydomonas (c) Blue-green algae (iii) Nostoc (d) Brown algae (iv) Polysiphonia (v) Ulothrix (vi) Anabaena (vii) Sargassum (viii) Fucus A. (a)-(ii, v), (b)-(i, vi), (c)-(iii, iv), (d)-(vii, viii) B. (a)-(ii, v), (b)-(i, iv), (c)-(iii, vi), (d)-(vii, viii) C. (a)-(ii, vii), (b)-(i, iv), (c)-(iii, vi), (d)-(v, viii) D. (a)-(ii, v), (b)-(iii, iv), (c)-(i, vi), (d)-(vii, viii)

43. Refer to the given experimental set-ups a and b and select the correct option regarding gases X and Y.

% of pollution

40. Identify P, Q, R and S in Present the given Venn diagram Bounded by double in plant and select the incorrect P membrane cell S option regarding them. R A. P could be a colourless Q organelle that helps Present in animal cell to store reserve food in the form of lipids, carbohydrates and proteins. B. Q could be an organelle that is involved in formation of spindle during cell division. C. R could be an organelle that contains genetic material organised as DNA along with proteins to form chromosomes. D. S could be an organelle that produces energy currency of the cell, ATP through cellular respiration.

A. X is the chamber where partially chewed food is stored temporarily. B. W is the chamber which is often referred to as true stomach which leads to small intestine. C. X is the chamber where anaerobic bacteria help in breakdown of cellulose. D. Y is the chamber where protein is digested with the help of enzymes.

% of pollution

39. Select the incorrect statement. I. Sulphur dioxide gas combines with haemoglobin of blood and prevents transport of oxygen by it. II. Methane, nitrous oxide and water vapour present in atmospheric air contribute to global warming. III. Lead emitted by automobile exhaust could cause brain damage. IV. Oxides of sulphur and nitrogen present in air could affect lungs. A. I only B. I and IV only C. I, II and IV only D. I and III only

Population of people

D. Population of people

Population of people

| NSO | Class-8 | Set-A | Level 1

ACHIEVERS SECTION Direction (Q. No. 46 and 47) : Read the given passage and select the correct option for the following questions. Figures show a negatively charged rod, an uncharged metal sphere on an insulating stand and a connection to the earth. Uncharged metal sphere

Connection to earth

Charged rod



II. In beaker ‘Q’, no reaction takes place. III. In beaker ‘R’, if ‘Y’ is aluminium then reaction will take place. IV. In beaker ‘R’, if ‘Y’ is tin then reaction will take place. A. I only B. II and IV only C. I and III only D. I, II, III and IV

49. Refer to the given flow chart and select the correct option regarding P, Q, R and S. Species included in No P the Red Data Book.

The given apparatus is used to charge the metal sphere positively. At the end of the charging process, the metal sphere has a charge of 15 C. The charging process takes 5 s.

Yes

46. Charging of the metal sphere involves different steps as shown below. + + + +

I.

III.

+ + +

IV.

Arrange these steps in correct order to charge the metal sphere. A. I, II, III, IV B. II, IV, III, I C. II, IV, I, III D. I, III, II, IV

48. Observe the given figure carefully.

(P)



Aqueous solution of copper (II) ions

Zinc

(Q)

Aqueous solution of iron (II) ions

R

No

A. P could be wild buffalo whereas Q could be chinkara. B. Q could be golden langur whereas S could be passenger pigeon. C. R could be Hawaiian crow whereas S could be Asiatic lion. D. Q could be Asiatic wild ass whereas R could be Tibetan antelope. 50. The given graph shows the blood examination report of Mr X.

Metal ‘Y’

(R)

Aqueous solution of zinc (II) ions

Select the correct statement(s) from the following. I. In beaker ‘P’, blue colour of solution changes to green colour.

Blood cell count

47. If average current is defined as net charge flowing per unit time, then find the average current in the charging process. 5s A. 15 C × 5 s B. 15 C 15 C 15 × 2 C C. D. 5s 5s Iron

Species likely to become endangered Yes in near future. S

+

++ + + + +++

Q

No

+ – + – + – + –

II.

It is categorised as an Yes endangered species.

Key :

Platelets (normal range)

WBC

RBC (normal range)

Platelets RBC

WBC (normal range) Blood sample of Mr X



What can be inferred about the condition of Mr X? A. Mr X is anaemic as his RBC count is slightly more than the normal reference range. B. Mr X lives in plains and has recently gone to some higher altitude place where he has successfully acclimatised with the prevailing conditions. C. Mr X is suffering from an infection like dengue as his platelet count is very high. D. Mr X has delayed blood clotting and continues to bleed even from a minor cut.

SPACE FOR ROUGH WORK

NSO | Class-8 | Set-A | Level 1 |

7

Class 8

Set B Year 2018

LOGICAL REASONING 1.

Find the figure from the options which will continue the same series as established by the Problem Figures. Problem Figures =

X

C

O

T

A.

S

O

X

= S

B.

S T

X

X

=

C.

S

S S

6.

D.

S

7. T

2.

If in a certain code language, ‘men are very busy’ is written as ‘1234’, ‘busy persons need encouragement’ is written as ‘4567’, ‘encouragement is very important’ is written as ‘3589’ and ‘important persons are rare’ is written as ‘2680’, then how will ‘encouragement’ be written in that language?

A. 5 3.

B. 6

C. 8

D. 9

(i)

8.

R R

P

P

C.

D. P

B. R

R

4.

How many pairs of letters are there in the word ‘CONTEMPORARY’ which have as many letters between them in the word as in the English alphabets?



A. Three C. Four

5.

Two positions of a dice are given. What number will be on the face opposite to the face having number 5?



A. 1 B. 3 C. 4 D. 2





B. Two D. More than four

3

9.



6

5 4

(ii)

(iii)

#

A. +

P

A. P

There is a certain relationship between the figures (i) and (ii). Establish the same relationship between the figures (iii) and (iv) by selecting a suitable figure from the options which will replace the (?) in figure (iv).

(iv)

#

B.

+

#

C.

D. +

Select the correct water image of the given figure.

R

Dilip’s position from the left in a row of students is 10th and Jagdish’s position is 20th from the right. Both of them interchange their positions and Jagdish becomes 23rd from the right. How many students are there in the row? A. 33 B. 44 C. 32 D. 42

1

3

$

#

If ‘D’ denotes ‘equal to’; ‘ ’ denotes ‘not equal to’; ‘+’ denotes ‘greater than’; ‘–’ denotes ‘less than’; ‘×’ denotes ‘not greater than’; ‘÷’ denotes ‘not less than’ then a – b – c implies _______. A. a – b + c B. b + a – c C. c × b + a D. None of these If ‘A × B’ means that ‘A is the sister of B’, ‘A ÷ B’ means that ‘A is the daughter of B’, ‘A – B’ means that ‘A is the son of B’, then how is P related to S in relationship P – Q × R ÷ S ? A. Brother B. Son C. Grandson D. None of these

10. Count the number of triangles in the given figure.

A. 25



B. 23



C. 27



D. None of these

SCIENCE 11. The diagram shows what happens when weights of different masses are placed on the same spring.

12. Which of the following light rays behaves correctly when it passes through the converging lens? I

Key : 30 cm I

26 cm II

20 cm III



1 kg 2 kg 4 kg

Which of the following is the original length of the spring? A. 20 cm B. 26 cm C. 36 cm D. 50 cm

2

F

F III

II IV

Converging lens



A. I

B. II

C. III

D. IV

| NSO | Class-8 | Set-B | Level 1

13. The speed-time graphs Speed (m s–1) for three moving vehicles 10 I, II and III are shown I here. If x, y and z are the III 5 distances travelled by I, II II and III respectively in 0 8 8 s, then which of the following comparisons is correct? A. x > y = z B. x > y > z C. x = y < z D. x < y < z

Time (s)

14. Arrange the following planets in decreasing order of time required to complete one revolution around the sun. (i) Earth (ii) Uranus (iii) Mars (iv) Jupiter A. (i), (ii), (iii), (iv) B. (i), (iii), (iv), (ii) C. (iv), (iii), (ii), (i) D. (ii), (iv), (iii), (i) 15. The given figure shows a gas trapped in X part X of an apparatus 150 mm 80 mm Gas containing mercury. If the atmospheric Mercury 300 mm pressure is 760 mm Hg, then what is the pressure of the gas? (Figure is not drawn to the scale.) A. 80 mm Hg B. 150 mm Hg C. 300 mm Hg D. 910 mm Hg 16. Three plotting compasses are placed close to a current carrying wire wrapped around an insulator as shown in the figure. Plotting compasses



How many compass needles will change direction if the current through the wire is increased? (Ignore the effect of the earth’s magnetic field.) A. 0 B. 1 C. 2 D. 3

17. Consider the given statements and select the option which correctly identifies true (T) and false (F) ones. (i) When a body is in steady motion on a surface, the force of friction is dynamic friction. (ii) The force of friction between two bodies always acts parallel to the surfaces in contact with each other. (iii) It is easier to push a lawn roller than to pull. (iv) Limiting friction is greater than sliding friction. (i) A. T B. F C. T D. T

(ii) (iii) (iv) F T F T F T T T F T F T

NSO | Class-8 | Set-B | Level 1 |

18. Match column I with column II and select the correct option from the given codes : Column I Column II P. Bulb (i) Chemical effect of current Q. Electrolyte (ii) Heating effect of current R. Electroplating (iii) Conducting solution A. P - (i), Q - (ii), R - (iii) B. P - (iii), Q - (i), R - (ii) C. P - (i), Q - (iii), R - (ii) D. P - (ii), Q - (iii), R - (i) 19. What is the best thing to do when strong winds are blowing over a hut having a weak thatched roof ? A. Open the doors and windows. B. Close the doors and windows. C. Make holes in the roof. D. Burn wood inside. 20. A body goes 20 km east, then 10 km north, then 50 km west and then 30 km east. Find the displacement of the body from the initial position. A. 0 km B. 20 km C. 10 km D. 110 km 21. Read the given statements and select the correct option. Statement 1 : The amount of heat produced in a current carrying wire does not depend on its material. Statement 2 : If a large current passes through the filament of an electric bulb, then the filament may become so hot that it may even melt and break. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Statement 1 is false and statement 2 is true. 22. David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be A. 3 m B. 5 m C. 6 m D. 8 m 23. A laboratory thermometer gave the reading of –1°C and 99°C when inserted into melting ice and boiling water respectively, both at standard atmospheric pressure. What is the error when the same thermometer is used to measure the difference between two arbitrary temperatures? A. –1°C B. 1°C C. 0°C D. 2°C 24. An object of weight W is pulled along a rough horizontal surface by a force F. The force of friction is Fr. Which diagram correctly shows the direction of these forces on the object? F

W

F

A.

B. Fr

Fr



C.

Fr

W F

D.

W

F Fr

W

3

25. Match column I with column II and select the correct option from the given codes.

Fe

Column I Column II P. Bulb (i)

Q. Cell





(ii)



R. Battery



(iii)



S. Wire



(iv)



T. Open switch

(v)



A. B. C. D.



P - (ii), Q - (iii), R - (v), S - (i), T - (iv) P - (v), Q - (iv), R - (ii), S - (i), T - (iii) P - (v), Q - (ii), R - (iv), S - (i), T - (iii) P - (i), Q - (ii), R - (iii), S - (iv), T - (v)

26. Match column I with column II and select the correct option from the given codes. Column I Column II P. Kerosene (i) Road surfacing Q. Paraffin wax (ii) Fuel for vehicles R. Bitumen (iii) Manufacturing candles S. Gasoline (iv) Jet engine fuel

A. B. C. D.

P-(ii); Q -(iv); R-(iii); S -(i) P-(iii); Q-(ii); R-(iv); S-(i) P-(iv); Q-(ii); R-(i); S-(iii) P-(iv); Q-(iii); R-(i); S-(ii)

Solution of sulphate Set-up I of X



29. Savita had four metals : iron, zinc, X and Y. She arranged the following experimental set-ups and observed that displacement reaction took place in each case. 4

Metals X and Y are respectively A. Al and Ag B. Cu and Mg C. Ag and Cu D. Cu and Ag

31. Ms. Ruchi, a class 8 teacher heated five different substances (I-V) in air and tabulated her observations as follows : Subs- Appearance Appearance tance at the start of at the end of experiment experiment Purple I Purple crystals vapours



28. Read the given statements and select the correct option. Statement 1 : Petroleum is a fossil fuel. Statement 2 : Kerosene is not obtained as a fraction of fractional distillation of petroleum. A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C. Statement 1 is true and statement 2 is false. D. Both statements 1 and 2 are false.

Solution Solution of sulphate of sulphate Set-up III of Y Set-up II of X

30. Select the correct option for the given statements. I. Plastics are generally good conductors of electricity. II. Ropes made by bakelite are used in cranes and elevators. III. Teflon is a special plastic on which oil and water do not stick. IV. Plastic is non-biodegradable, hence not environment friendly. I II III IV A. True True False False B. False False True True C. True False True False D. False True False True

27. Priya, a class 8 student collected following items (i-vi) and tested them with different indicators : (i) Toothpaste (ii) Vinegar (iii) Curd (iv) Lemon (vi) Limestone (v) Baking soda Fill in the blanks by selecting an appropriate option. She observed that with p , methyl orange indicator turned yellow while with q , China rose indicator turned magenta. q p A. (ii), (iii), (iv) (i), (v), (vi) B. (i), (iv), (vi) (ii), (iii), (v) C. (i), (v), (vi) (ii), (iii), (iv) D. (ii), (iv), (v) (i), (iii), (vi)

X

Zn

II

Grey metal

III

White solid

IV

Green powder Grey rod

V

White ash White solid Black residue Turned red

Change in mass No change Gain in mass Loss in mass Loss in mass No change

Effects of heating Turned to purple vapours on heating and back to purple solid when cooled Burned with an intense white flame Produced carbon dioxide gas Produced carbon dioxide gas Tu r n e d r e d o n heating and grey when cooled



Identify the types of changes these substances have undergone and select the correct option. Physical change Chemical change A. II, III and IV I and V B. I and II III, IV and V C. I and V II, III and IV D. II and V I, III and IV 32. Which of the following statements is/are correct?

I. LPG is non-flammable substance, that is why it is used for cooking at our homes.



II. On burning, camphor produces flame while charcoal does not produce flame.



III. Sulphur is a non-combustible non-metal.



IV. Combustion of phosphorus is an example of rapid combustion. | NSO | Class-8 | Set-B | Level 1



A. II and IV only C. I, III and IV only

B. II only D. None of these

33. Study the given Venn diagram carefully and fill in the blanks. Physical Chemical change 1 change 2

3

Irreversible change

A. B. C. D.

1 Weathering of rocks Crumpling of paper Burning of a candle Burning of LPG in kitchen

2 3 Making fibre Rancidity from yarn Baking of Plucking corns a flower Inflating Dissolving a tyre sugar in water Bursting of Metabolism a balloon of food

34. Read the given paragraph where few words have been italicised. Pituitary gland is located just below hypothalamus and controls the activity of other glands. Thyroid gland is located in front of the neck. It secretes hormone thyroxine which regulates metabolism. Parathyroid gland secretes hormone calcitonin that regulates level of calcium in blood. Adrenal glands are paired glands present on top of each ovary. They secrete hormone parathormone. Select the correct option regarding these. A. Neck and thyroxine should not be replaced as they are correctly mentioned. B. Calcitonin should be replaced with insulin. C. Ovary and parathormone should not be replaced as they are correctly mentioned. D. Hypothalamus must be replaced by medulla oblongata. 35. Refer to the given figure regarding zonation in terrestrial biosphere reserve and select the correct option. A. B. C. D.

X Cropping is allowed Used for research and education Cropping is allowed No human activity allowed

Y Used for research and education Human settlement allowed

X Y

NSO | Class-8 | Set-B | Level 1 |

37. The given box shows some rabi and kharif crops. Identify these crops and select the option that correctly categorises them.

Z

Sugarcane, Cotton, Mustard, Maize, Sorghum, Linseed, Barley, Groundnut, Wheat, Chickpea, Soybean A. Rabi - Wheat, Barley, Linseed, Cotton, Maize Kharif - Sugarcane, Mustard, Groundnut, Soybean, Chickpea, Sorghum B. Rabi - Mustard, Linseed, Barley, Wheat, Chickpea Kharif - S ugarcane, Cotton, Maize, Sorghum, Groundnut, Soybean C. Rabi - S ugarcane, Linseed, Groundnut, Wheat, Soybean Kharif - M ustard, Cotton, Barley, Sorghum, Chickpea, Maize D. Rabi - Wheat, Barley, Sugarcane, Sorghum, Chickpea Kharif - L inseed, Soybean, Mustard, Cotton, Groundnut, Maize

38. Refer to the given diagram. Organism A Gamete X



Z No human activity allowed Cropping is allowed

No human activity Used for allowed research and education Human settlement Cropping is allowed allowed

36. After vigorous exercise, changes occur in the muscle tissue. Compared with ‘at rest’ conditions what will the changes be? Glycogen ATP Lactate pH A. Decreased Decreased Increased Decreased B. Decreased Increased Increased Increased C. Increased Increased Increased Increased D. Increased Decreased Decreased Increased



Gamete Y

Fertilisation within Zygote body

Organism I

Organism II

Gamete X

Gamete Y

Fertilisation in outer medium

Zygote

Select the correct option regarding this. A. Organism A is hermaphrodite or bisexual and may undergo either self or cross fertilisation. B. Organisms I and II are unisexual and exhibit external fertilisation. C. Organism A could be Taenia if it undergoes self fertilisation or it could be earthworm if it undergoes cross fertilisation. D. All of these

39. Which of the given containers will continue to have healthy fish and plants at the end of a week? Layer of oil

Clear water

A.



B.

Suspended matter

C.



D. None of these

5

40. Read the given paragraph. The cytoplasm of the cells of a tomato plant contains organelle X which is of several types. Type Y is present in leaves of plant and imparts green colour whereas type Z is present in fruits of plant and imparts red colour. Select the option which correctly identifies X, Y and Z.   X   Y   Z A. Plastid Leucoplast Chromoplast B. Plastid Chloroplast Chromoplast C. Plastid Chloroplast Leucoplast D. Plastid Chromoplast Chloroplast 41. Refer to the given figure and select the incorrect option. X A. Self pollination is not possible Y in a flower that lacks either X Z or Y. W B. Monoecious plants like maize bear two types of flower, one with X and other with Y. C. W and Z constitute non-essential floral whorls. D. Plants with flowers having both X and Y can never undergo cross pollination. 42. Refer to the given set-up. 0.5 M Salt solution

100 mL

Water

Visking tubing 3

120 mL

80 mL

Visking tubing 1 Water Test tube P

0.2 M Salt solution

Visking tubing 2

Test tube Q

0.8 M Sugar solution

0.2 M Salt solution

Test tube R

A.

Volume of liquid (mL)

Volume of liquid (mL)

R Q Time (min) Q

C.

Time (min)



44. The given table describes the amount of pollutants in body of aquatic organisms in a river. Organism

Amount of lead in the body of the organism (ppm) 1.6 P 4.3 Q 0.025 R 2.4 S 0.16 T Select the option that correctly arranges these organisms in a food chain. A. Q→S→P→T→R B. R→T→P→S→Q C. T→P→Q→S→R D. R→P→T→Q→S 45. Rahul conducted an experiment to calculate percolation rate of three soil samples X, Y and Z and tabulated his results as follows : Soil sample X Y Z

Q



Time (min) Q

P D. R



(a) Zygote divides a number of times and forms a hollow ball like structure called (i) . It moves down and gets implanted in the uterus. It starts developing body parts and at this stage it is called (ii) . (b) (iii) is the period in life when a girl or a boy attains sexual maturity. (c) Production of sex hormones is under the control of (iv) gland. (d) Metamorphosis in frog requires presence of (v) in water to produce thyroxine hormone. A. (i) - Fetus, (iv) - Thymus B. (ii) - Embryo, (iv) - Pituitary C. (iii) - Adolescence, (v) - Calcium D. (ii) - Fetus, (iii) - Senescence

P R

P B.

Volume of liquid (mL)

Volume of liquid (mL)

Select the option that correctly identifies the volume of liquid in test tubes P, Q and R after some time.





R P Time (min)

43. Read the given statements and select the option that correctly fills the blanks in any two of them.



Rate of percolation 10 mL/min 25 mL/min 5 mL/min

Identify soils X, Y and Z and select the incorrect option regarding them. A. Soil Y is abundantly found in those areas where plants with thick, fleshy and photosynthetic stems are present. B. Soil Z is abundantly found in those areas where plants with aerial breathing roots are present. C. Soil X is best suited for growth of wheat and maize. D. None of these

ACHIEVERS SECTION 46. Identify the given organisms (P-S) and select the incorrect option regarding them.

P 6

Q

R

S

A. P could be an eukaryotic organism that causes abdominal discomfort in man. B. Q could be a prokaryotic organism that helps in breakdown of dead bodies of plants and animals. C. Organism R could be used to obtain antibiotics. D. S could be an organism that causes sleeping sickness in humans. | NSO | Class-8 | Set-B | Level 1

47. Refer to the given dichotomous key and select the correct option regarding cell organelles L - O. I. (a) Cell organelle bounded by double membrane - Go to II 





II. (a) Directs cell growth and controls its activities - L







III. (a) Removes dead cells and digests foreign material - N 





(b) Cell organelle bounded by single membrane  - Go to III

  String  

Height of release

(b) Carries out some oxidative reactions in a cell -    O

48. The given figure represents the fractionating column used in refining of petroleum.

fraction X fraction Y heated petroleum

fraction Z

Which of the following statements about the fractions X, Y and Z is/are incorrect?



I. The order of their densities is X > Y > Z.



II. The fraction Z will condense first and the fraction X will condense at the last.



III. The order of their boiling points is X < Y < Z.

IV. X can be heavy oil, Y can be light oil while Z can be gasoline and naphtha. A. I and IV only B. I only

C. II and III only



D. None of these

Pendulum bob

  One complete swing 

(b) Provides colour to flowers and fruits - M

A. L could be mitochondria whereas M could be chloroplast. B. M could be chromoplast whereas N could be Golgi apparatus. C. L could be nucleus whereas O could be peroxisome. D. M could be leucoplast whereas N could be vacuole.



Direction (Q. No. 49 and 50) : Read the given passage and answer the following questions. The figure shows a pendulum.

Deepak wanted to find out the time taken by the pendulum to make a complete swing as shown in the figure. He adjusted the factors used in the experiment. The time period of a simple l pendulum is calculated by using T = 2π g where l = length of pendulum, g = 980 cm/s2. He then tabulated his results in the following table : Set-up

Mass of pendulum Length of Height of bob (g) string (cm) release (cm)

I II III IV V

30 40 30 50 40

6 10 8 6 8

2 5 2 5 2

49. To find out how the difference in the mass of the pendulum bob would affect the time taken for the pendulum bob to make a complete swing, which two set-ups should Deepak use for comparison? A. Set-ups I and III B. Set-ups I and IV C. Set-ups II and V D. Set-ups III and V 50. Which of the following graphs best represents the variation of T 2 with l? T2

T2

B.

A. l T2

T2

C.

l

D. l

l

SPACE FOR ROUGH WORK

NSO | Class-8 | Set-B | Level 1 |

7

ANSWER KEYS NSO 2014 SET A 1. (D)

2. (A)

3. (A)

4. (B)

5. (B)

6. (B)

7. (D)

8. (B)

9.

(D)

10. (B)

11. (B)

12. (D)

13. (D)

14. (D)

15. (C)

16. (B)

17. (B)

18. (A)

19. (C)

20. (B)

21. (C)

22. (D)

23. (A)

24. (C)

25. (D)

26. (A)

27. (D)

28. (A)

29. (B)

30. (A)

31. (C)

32. (B)

33. (B)

34. (A)

35. (C)

36. (C)

37. (D)

38. (D)

39. (A)

40. (B)

41. (D)

42. (B)

43. (D)

44. (D)

45. (D)

46. (D)

47. (D)

48. (C)

49. (D)

50. (D)

SET B 1. (A)

2. (D)

3. (B)

4. (B)

5. (D)

6. (D)

7. (C)

8. (D)

9.

(C)

10. (C)

11. (D)

12. (A)

13. (A)

14. (C)

15. (C)

16. (B)

17. (B)

18. (B)

19. (D)

20. (A)

21. (C)

22. (B)

23. (B)

24. (B)

25. (A)

26. (C)

27. (B)

28. (A)

29. (B)

30. (C)

31. (D)

32. (C)

33. (C)

34. (D)

35. (A)

36. (A)

37. (A)

38. (D)

39. (A)

40. (D)

41. (B)

42. (B)

43. (D)

44. (C)

45. (B)

46. (C)

47. (D)

48. (D)

49. (B)

50. (B)

7. (B) 17. (D) 27. (D) 37. (D) 47. (C)

8. (D) 18. (B) 28. (D) 38. (A) 48. (A)

9. 19. 29. 39. 49.

(C) (C) (A) (C) (D)

10. 20. 30. 40. 50.

(A) (A) (B) (D) (C)

7. (B) 17. (B) 27. (C) 37. (D) 47. (C)

8. (A) 18. (D) 28. (D) 38. (B) 48. (B)

9. 19. 29. 39. 49.

(C) (C) (C) (B) (D)

10. 20. 30. 40. 50.

(C) (D) (B) (A) (B)

SET A 1. (B) 2. (B) 3. (C) 4. (D) 5. (D) 6. (C) 11. (D) 12. (A) 13. (A) 14. (D) 15. (C) 16. (C) 21. (C) 22. (A) 23. (B) 24. (A) 25. (B) 26. (C) 31. (C) 32. (D) 33. (D) 34. (D) 35. (A) 36. (B) 41. (C) 42. (D) 43. (D) 44. (B) 45. (A) 46. (A)

7. (B) 17. (C) 27. (C) 37. (C) 47. (C)

8. (A) 18. (A) 28. (B) 38. (A) 48. (D)

9. 19. 29. 39. 49.

(C) (C) (C) (B) (C)

10. 20. 30. 40. 50.

(C) (C) (D) (C) (B)

SET B 1. (C) 2. (B) 3. (D) 4. (B) 5. (B) 6. (D) 11. (C) 12. (D) 13. (C) 14. (A) 15. (D) 16. (A) 21. (B) 22. (D) 23. (C) 24. (D) 25. (A) 26. (C) 31. (B) 32. (C) 33. (C) 34. (D) 35. (B) 36. (B) 41. (B) 42. (C) 43. (C) 44. (B) 45. (D) 46. (C)

7. (A) 17. (C) 27. (B) 37. (D) 47. (A)

8. (A) 18. (B) 28. (A) 38. (B) 48. (C)

9. 19. 29. 39. 49.

(D) (B) (D) (D) (C)

10. 20. 30. 40. 50.

(A) (B) (C) (C) (D)

7. (B) 17. (A) 27. (C) 37. (D) 47. (B)

8. (D) 18. (B) 28. (B) 38. (D) 48. (B)

9. 19. 29. 39. 49.

(C) (B) (C) (A) (C)

10. 20. 30. 40. 50.

(C) (D) (C) (D) (C)

NSO 2015 1. (B) 11. (D) 21. (D) 31. (C) 41. (D)

2. (C) 12. (C) 22. (A) 32. (C) 42. (C)

3. (C) 13. (D) 23. (B) 33. (D) 43. (D)

4. (C) 14. (A) 24. (B) 34. (B) 44. (D)

SET 1 5. (D) 6. (A) 15. (D) 16. (B) 25. (D) 26. (A) 35. (D) 36. (D) 45. (D) 46. (B)

SET 2 1. (D) 2. (C) 3. (B) 4. (B) 5. (A) 6. (D) 11. (C) 12. (D) 13. (B) 14. (C) 15. (D) 16. (C) 21. (B) 22. (B) 23. (C) 24. (B) 25. (A) 26. (A) 31. (C) 32. (A) 33. (B) 34. (D) 35. (C) 36. (B) 41. (A) 42. (D) 43. (C) 44. (B) 45. (C) 46. (B)

NSO 2016

NSO 2017 SET A 1. (A) 2. (A) 3. (B) 4. (D) 5. (A) 6. (A) 11. (C) 12. (A) 13. (B) 14. (A) 15. (A) 16. (D) 21. (C) 22. (C) 23. (C) 24. (A) 25. (C) 26. (A) 31. (C) 32. (D) 33. (D) 34. (B) 35. (C) 36. (D) 41. (B) 42. (D) 43. (B) 44. (A) 45. (D) 46. (A)

SET B 1. (C) 2. (A) 3. (C) 4. (A) 5. (D) 6. (A) 11. (B) 12. (A) 13. (D) 14. (D) 15. (C) 16. (C) 21. (D) 22. (A) 23. (B) 24. (C) 25. (C) 26. (C) 31. (C) 32. (A) 33. (C) 34. (D) 35. (B) 36. (B) 41. (A) 42. (D) 43. (A) 44. (B) 45. (A) 46. (B)

7. (C) 17. (D) 27. (B) 37. (A) 47. (C)

8. (D) 18. (B) 28. (C) 38. (B) 48. (B)

9. 19. 29. 39. 49.

(B) (D) (B) (C) (B)

10. 20. 30. 40. 50.

(A) (C) (C) (C) (A)

NSO 2018 1. (A) 11. (C) 21. (B) 31. (A) 41. (B)

2. (A) 12. (C) 22. (A) 32. (D) 42. (B)

3. (D) 13. (A) 23. (C) 33. (A) 43. (B)

4. (A) 14. (B) 24. (D) 34. (A) 44. (C)

SET A 5. (A) 6. (C) 15. (D) 16. (D) 25. (C) 26. (D) 35. (A) 36. (A) 45. (C) 46. (C)

7. (D) 17. (C) 27. (D) 37. (A) 47. (D)

8. (D) 18. (A) 28. (B) 38. (C) 48. (C)

9. 19. 29. 39. 49.

(D) (B) (C) (A) (B)

10. 20. 30. 40. 50.

(C) (C) (B) (C) (B)

1. (A) 11. (C) 21. (D) 31. (C) 41. (D)

2. (A) 12. (C) 22. (C) 32. (B) 42. (D)

3. (A) 13. (A) 23. (C) 33. (D) 43. (B)

4. (D) 14. (D) 24. (C) 34. (A) 44. (B)

SET B 5. (C) 6. (C) 15. (D) 16. (A) 25. (B) 26. (D) 35. (A) 36. (A) 45. (D) 46. (B)

7. (B) 17. (D) 27. (C) 37. (B) 47. (C)

8. (D) 18. (D) 28. (C) 38. (D) 48. (A)

9. 19. 29. 39. 49.

(C) (A) (D) (A) (D)

10. 20. 30. 40. 50.

(D) (C) (B) (B) (A)