Champ Test Physics Xi

Physics XI 1.

2. 3. 4. 5. 6. 7. 8. 9.

10.

11. 12. 13. 14.

Scalars and Vectors

Champ Test

Which of the following is NOT a Scalar? I. Temperature II. Power III. Displacement IV. Sheering Stress a) IV only b) III only c) II & IV only d) I only Vector changes its effect with change in: a) Direction and magnitude b) unit and point c) point of application d) N.O.T Which of the following pairs contains one vector and other scalar quantity? a) Electric field, Electric flux b) Velocity, angular momentum c) Work, power d) charge, current ̂ is: ⃗⃗ = 𝟔𝒊̂ + 𝟐𝒋̂ + 𝟑𝒌 The unit which is parallel to vector 𝑩 ̂ ̂ 6𝑖̂ 2𝑗̂ 3𝑘 2𝑖̂ 2𝑗̂ 𝑘 ̂ 2𝑖̂ 2𝑗̂ 𝑘 ̂ 6𝑖̂ 2𝑗̂ 3𝑘 a) − + b) − − c) + − d) + + 3 3 3 3 3 3 3 3 3 7 7 7 The vector joining the points (1, 1, -1) and (2, -3, 4) is a) −𝑖̂ + 4𝑗̂ − 5𝑘̂ b) 𝑖̂ − 4𝑗̂ + 5𝑘̂ c) î − 4𝑗̂ − 5𝑘̂ d) 𝑖̂ − 4𝑗̂ + 5𝑘̂ ⃗ , we get ____. When a null vector is subtracted to any vector 𝐀 ⃗ only a) Null vector b) A c) Unit vector d) Negative Vector ⃗⃗ + 𝑩 ⃗⃗ |=|𝑨 ⃗⃗ |−|𝑩 ⃗⃗ |, then angle between 𝑨 ⃗⃗ 𝐚𝐧𝐝 𝑩 ⃗⃗ will be: If |𝑨 a) 180° b) 90° c) 45° d) 0° Two forces each of magnitude is F acting on a particle yield a resultant of √𝟐F then angle between forces is: a) 180° b) 90° c) 45° d) 0° There are two forces of 3N and other of 4 N at what angle the two vectors be added to get resultant vector of 7 N, 1N and 5N respectively. a) 0°, 180° and 90° b) 0°, 90° and 180° c) 0°, 180° and 60° d) 90°, 900° and 0° Two forces of magnitudes 3N and 4N are acted on a body. The ratio of magnitude of minimum and maximum resultant force on the body is a) 1/7 b) 3/2 c) 3/7 d) 5/4 Ahmed pulls the door by 4N force while at the same time Ali pushes the same door with 3N, the net force acting on the door is: a) 7N b) 5N c) 1N d) 3N Which of the following pair of forces can’t have a resultant equal to 4 N? a) 2 N and 2 N b) 2 N and 4 N c) 2 N and 8 N d) 2 N and 6 N A force of 100 N acting on body along the x-axis then y-component of force is: a) 25 b) 50 c) 0 d) 100 The X and Y components of a force F acting 𝟑𝟎° to x-axis are respectively: a)

𝐹 √2

,F

𝐹 √3 𝐹 2 2

b) ,

c)

𝐹 √3 𝐹, 2 2

d) 𝐹,

𝐹 √2

15. The angle made by the vector 𝒊̂ + 𝒋̂ with x-axis is: a) 90 ° b) 45° c) 22.5° d) 30° ̂ is perpendicular to 𝟐𝒊̂ + 𝒃𝒋̂ + 𝟔𝒌 ̂ , then the value of b is : 16. If 𝟑𝒊̂ − 𝟐𝒋̂ + 𝒌 a) 2 b) 4 c) 5 d) 6 ⃗⃗ = 𝑨 ⃗⃗ + 𝑩 ⃗⃗ and |𝑹 ⃗⃗ | = |𝑨 ⃗⃗ | − |𝑩 ⃗⃗ | whereas |𝑨 ⃗⃗ | = 𝟑 𝐚𝐧𝐝 |𝑩 ⃗⃗ | = 𝟔 then, 𝑨 ⃗⃗ ∙ 𝑩 ⃗⃗ =____. 17. If 𝑹 a) −18 b) 18 c) 9 d) 0 ̂∙𝒌 ̂ ) =___. 18. (𝐢̂ ∙ 𝐢̂) − (𝒋̂ ∙ 𝒋̂) − (𝒌 a) 1 b) 0 c) 2 d) -1 ̂ ) N displaces a body through (𝟑𝒊̂ + 𝟔𝒌 ̂ )𝒎. The work done is: 19. A force of (𝟒𝒋̂ + 𝟓𝒌 a) 12J b) 30 J c) 42J d) 50 J 20. Which of the given pair has angle 180 degree with each other? a) Centripetal and Centrifugal force b) Drag force and weight of droplet ⃗ and 𝐵 ⃗ ×𝐴 c) 𝐴 × 𝐵 d) All are correct 21. A physical quantity which has both magnitude and direction but does not satisfies parallelogram law of addition: a) must be a vector b) may be a vector c) may be both scalar and vector d) scalar ⃗⃗ ∙ 𝑩 ⃗⃗ = 𝟎, then |𝑨 ⃗⃗ × 𝑩 ⃗⃗ | = 𝟏, then 𝑨 ⃗⃗ and 𝑩 ⃗⃗ are 22. If 𝑨 a) perpendicular unit vectors b) parallel unit vectors c) parallel d) perpendicular ⃗⃗ = 𝑨 ⃗⃗ + 𝑩 ⃗⃗ and |𝑹 ⃗⃗ | = |𝑨 ⃗⃗ | − |𝑩 ⃗⃗ | whereas |𝑨 ⃗⃗ | = 𝟑 𝐚𝐧𝐝 |𝑩 ⃗⃗ | = 𝟔 then, |𝑨 ⃗⃗ × 𝑩 ⃗⃗ | =____. 23. If 𝑹 a) −18 b) 18 c) 9 d) 0 ⃗⃗ 𝟏 & 𝑹 ⃗⃗ 𝟐 are position vector, having magnitudes 4 and 3 units making angle 30° and 60° with +x-axis then magnitude of their 24. 𝑹 cross product is: a) 12 b) 5 c) 0 d) 6 25. Which of the following is incorrect? ⃗ =𝐵 ⃗ +𝐴 ⃗ = −𝐵 ⃗ ×𝐴 ⃗ =𝐵 ⃗ ∙𝐴 ⃗ =𝐵 ⃗ −𝐴 a) 𝐴 + 𝐵 b) 𝐴 × 𝐵 c) 𝐴 ∙ 𝐵 d) 𝐴 − 𝐵