Multiple Choice Questions (mcq) With Answers On Dc Circuits
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Multiple Choice Questions (MCQ) with Answers on DC Circuits a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
1-The nucleus of an atom consists of Protons Neutrons Protons and Neutrons Electrons and Protons (Ans: c) 2-A body contains electrons more than its normal number has +ve charge –ve charge No charge None of the above (Ans: b) 3-The SI unit for measurement of electric charge is volt columb ohm farad (Ans: b) 4-One columb is approximately equal to 624 x 10^12 624 x 10^14 624 x 10^16 624 x 10^18 (Ans: c) 5-The ____ is responsible for the current to flow in a closed circuit. Electric charge Potential difference Resistance All of the above (Ans: b)
6-Any charged conductor, which receives electricity from the earth, when connected to it, is said to be a. Zero potential b. –ve potential c. +ve potential
d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b.
None of the above (Ans: b) 7-Resistance of a wire is directly proportional to its Length Diameter Area of cross section All of the above (Ans: a) 8-Reciprocal of resistance is called Resistivity Conductance Resonance None of the above (Ans: b) 9-A coil consists of 8 turns of copper wire have cross section area of 1mm^2. The resistance of the coil, when mean length per turn is 0.02μΩm, is 0.96 ohm 0.48 ohm 1.82 ohm 1.44 ohm (Ans: a) 10-The following is (are) the semiconductor(s) Silicon Germanium Carbon All of the above (Ans: d) 11-The resistance of pure metallic conductor _____ with the _______ in temperature. increases, increase increases, decrease remains same, increase remains same, decrease (Ans: a) 12-One kilowatt equals to _____ horse power. 1.26 1.36
c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
1.46 1.56 (Ans: b) 13-The output of motor in watts when it takes a power of 3kw and its efficiency is 75%, is 2000 2250 2500 2750 (Ans: b) 14-If three resistance (R1, R2 & R3) are connected in series then V = IR1 + IR2 + IR3 V = I/R1 + I/R2 + I/R3 I = VR1 + VR2 + VR3 I = V/R1 + V/R2 + V/R3 Where V=Potential difference, I=Current (Ans: a) 15-When the resistances are connected in parallel circuit then branch currents are additive conductances are additive powers are additive All of the above (Ans: d)
Multiple Choice Questions (MCQ) with Answers on C Circuits
1 - The series and parallel resonance on L-C circuit' differs in that (A) Series resistance needs a low-resistance source for sharp rise in current (B) Series resonance needs a high-resistance source for sharp increase in current (C) Parallel resonance needs a low-resistance source for a sharp increase in impedance (D) Parallel resonance needs a low-resistance source for a sharp rise in line current Answer: Option A
2 - The power factor at resonance in R-L-C parallel circuit is (A) Zero (B) 0.08 lagging (C) 0.8 leading (D) Unity Answer: Option D 3 – In AC circuit containing pure capacitance has relation between current vector and emf vector π o (ωt + )
2 π o (ωt − ) 2 π o −ωt+ 2 π o ( −ωt) 2
(
)
Answer: Option A
4 – Instantaneous value of alternating emf is o E=E sin ωt o E=−E sin ωt +π o E=E sin(ωt ¿ )¿ 2
o E=E0 sin ωt Answer: Option D 5 – A coil of 300 turns is wounded on a ring of mild steel. If current in coil decreases from 8 ampere to 5 amperes then value of flux becomes 850 microweber. The effective self-inductance of coil for this change of coil will be o o o o
0.005 Henry 0.05 Henry 0.5 Henry Zero
Answer: Option D 6 – Magnetic field of 5x102 / π ampere turn / m is applied perpendicularly on a coil heaving area 10-2 m2 and number of turns 50. This coil is taken away from magnetic field in 0.1 second. The induced emf will be o 1 volt o 0.01 volt o 0.1 volt o 0.001 volt Answer: Option D 7 – If two resistances are connected in series then equivalent resistance is 25 Ώ while these resistances are connected parallel then equivalent resistance is 4 Ώ. The value of resistances will be o o o o
10 Ώ and 15 Ώ 20 Ώ and 5 Ώ 14 Ώ and 9 Ώ 5 Ώ and 19 Ώ
Answer: Option D 8 – Potentiometer is used to calculate o o o o
Current Resistance EMF Capacitance
Answer: Option C 9 – According to Kirchhoff’s law – o o o o
Algebraic sum at node is zero Charge remains conserved Charge can’t be stored at a point A node works like a power source
Answer: Option A, B, C 10 – According to Kirchhoff’s second law – o ∑ IR=−∑ E o −∑ IR=∑ E o ∑ IR=∑ E o ∑ IR=∑ I E Answer: Option C
Fill in the blanks – 1. Potential difference between two resistance remains __________. 2. In series combination the equivalent resistance R _____________. 3. Ohm’s law is given by ___________________. 4. Resistance in a circuit is calculated by ______. 5. Reversal of conductivity is termed as ______ and denoted by ____. 6. Resistivity of a conductive wire depends on its ______ and ______. 7. Dimensions of ohm is __________. 8. Root mean square value of alternation current and voltage are ___ and _____________. 9. In AC circuit containing pure inductance the phase angle between alternating emf and current is ___________. 10. Unit of electric charge is ____________.
a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
1-The nucleus of an atom consists of Protons Neutrons Protons and Neutrons Electrons and Protons (Ans: c) 2-A body contains electrons more than its normal number has +ve charge –ve charge No charge None of the above (Ans: b) 3-The SI unit for measurement of electric charge is volt columb ohm farad (Ans: b) 4-One columb is approximately equal to 624 x 10^12 624 x 10^14 624 x 10^16 624 x 10^18 (Ans: c) 5-The ____ is responsible for the current to flow in a closed circuit. Electric charge Potential difference Resistance All of the above (Ans: b)
6-Any charged conductor, which receives electricity from the earth, when connected to it, is said to be a. Zero potential b. –ve potential c. +ve potential
d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
a. b.
None of the above (Ans: b) 7-Resistance of a wire is directly proportional to its Length Diameter Area of cross section All of the above (Ans: a) 8-Reciprocal of resistance is called Resistivity Conductance Resonance None of the above (Ans: b) 9-A coil consists of 8 turns of copper wire have cross section area of 1mm^2. The resistance of the coil, when mean length per turn is 0.02μΩm, is 0.96 ohm 0.48 ohm 1.82 ohm 1.44 ohm (Ans: a) 10-The following is (are) the semiconductor(s) Silicon Germanium Carbon All of the above (Ans: d) 11-The resistance of pure metallic conductor _____ with the _______ in temperature. increases, increase increases, decrease remains same, increase remains same, decrease (Ans: a) 12-One kilowatt equals to _____ horse power. 1.26 1.36
c. d.
a. b. c. d.
a. b. c. d.
a. b. c. d.
1.46 1.56 (Ans: b) 13-The output of motor in watts when it takes a power of 3kw and its efficiency is 75%, is 2000 2250 2500 2750 (Ans: b) 14-If three resistance (R1, R2 & R3) are connected in series then V = IR1 + IR2 + IR3 V = I/R1 + I/R2 + I/R3 I = VR1 + VR2 + VR3 I = V/R1 + V/R2 + V/R3 Where V=Potential difference, I=Current (Ans: a) 15-When the resistances are connected in parallel circuit then branch currents are additive conductances are additive powers are additive All of the above (Ans: d)
Multiple Choice Questions (MCQ) with Answers on C Circuits
1 - The series and parallel resonance on L-C circuit' differs in that (A) Series resistance needs a low-resistance source for sharp rise in current (B) Series resonance needs a high-resistance source for sharp increase in current (C) Parallel resonance needs a low-resistance source for a sharp increase in impedance (D) Parallel resonance needs a low-resistance source for a sharp rise in line current Answer: Option A
2 - The power factor at resonance in R-L-C parallel circuit is (A) Zero (B) 0.08 lagging (C) 0.8 leading (D) Unity Answer: Option D 3 – In AC circuit containing pure capacitance has relation between current vector and emf vector π o (ωt + )
2 π o (ωt − ) 2 π o −ωt+ 2 π o ( −ωt) 2
(
)
Answer: Option A
4 – Instantaneous value of alternating emf is o E=E sin ωt o E=−E sin ωt +π o E=E sin(ωt ¿ )¿ 2
o E=E0 sin ωt Answer: Option D 5 – A coil of 300 turns is wounded on a ring of mild steel. If current in coil decreases from 8 ampere to 5 amperes then value of flux becomes 850 microweber. The effective self-inductance of coil for this change of coil will be o o o o
0.005 Henry 0.05 Henry 0.5 Henry Zero
Answer: Option D 6 – Magnetic field of 5x102 / π ampere turn / m is applied perpendicularly on a coil heaving area 10-2 m2 and number of turns 50. This coil is taken away from magnetic field in 0.1 second. The induced emf will be o 1 volt o 0.01 volt o 0.1 volt o 0.001 volt Answer: Option D 7 – If two resistances are connected in series then equivalent resistance is 25 Ώ while these resistances are connected parallel then equivalent resistance is 4 Ώ. The value of resistances will be o o o o
10 Ώ and 15 Ώ 20 Ώ and 5 Ώ 14 Ώ and 9 Ώ 5 Ώ and 19 Ώ
Answer: Option D 8 – Potentiometer is used to calculate o o o o
Current Resistance EMF Capacitance
Answer: Option C 9 – According to Kirchhoff’s law – o o o o
Algebraic sum at node is zero Charge remains conserved Charge can’t be stored at a point A node works like a power source
Answer: Option A, B, C 10 – According to Kirchhoff’s second law – o ∑ IR=−∑ E o −∑ IR=∑ E o ∑ IR=∑ E o ∑ IR=∑ I E Answer: Option C
Fill in the blanks – 1. Potential difference between two resistance remains __________. 2. In series combination the equivalent resistance R _____________. 3. Ohm’s law is given by ___________________. 4. Resistance in a circuit is calculated by ______. 5. Reversal of conductivity is termed as ______ and denoted by ____. 6. Resistivity of a conductive wire depends on its ______ and ______. 7. Dimensions of ohm is __________. 8. Root mean square value of alternation current and voltage are ___ and _____________. 9. In AC circuit containing pure inductance the phase angle between alternating emf and current is ___________. 10. Unit of electric charge is ____________.
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