**CBSE Class 12 Physics Chapter 3 Current Electricity MCQs**. These MCQs of Current Electricity chapter are prepared by our Physics Expert. By practising following MCQs, students will be able to quickly revise all the concepts of the chapter.

Additionally, these

**MCQs of****Current Electricity**will be helpfull for JEE And NEET Aspirants. These MCQs on Current Electricity chapter are prepared as per the latest curriculum issued by the CBSE.### CBSE Class 12 Physics Chapter 3 Current Electricity MCQs

1. The new resistance of the wire

will be if the resistance of a wire is 20 𝑜ℎ𝑚. If length becomes three times by stretching

(a) 6.67 ohms

(b) 60.0 ohms

(c) 120 ohms

(d) 180.0 ohms

Answer: 180.0 ohms

2. What will be Resistance if the length and area of crosssection both are doubled.

(a) Will become half

(b) Will remain the same

(c) Will be doubled

(d) Will become four times

Answer: Will remain the same

3. Current of 4.8 amperes is flowing

through a conductor. The number of

electrons per second will be

(a) 3 × 10^19

(b) 7.68 × 10^21

(c) 7.68 × 10^20

(d) 3 × 10^20

Answer: 3 × 10^19

4. If a 0.1 % increase in length due to

stretching, the percentage increase in its

resistance will be

(a) 0.2 %

(b) 2 %

(c) 1 %

(d) 0.1 %

Answer: 0.2 %

5. As the temperature of a metallic

resistor is increased, the product of

resistivity and conductivity :-

(a) increases

(b) decreases

(c) may increase or decrease

(d) remains constant

Answer: remains constant

6. At what temperature will the

resistance of a copper wire become three

times its value at 0°𝐶?

(a) 400° C

(b) 450° C

(c) 500° C

(d) 600° C

Answer: 500° C

7. The resistance of a conductor is

5 𝑜ℎ𝑚 at 50 °𝐶 and 6 𝑜ℎ𝑚 at 100 °𝐶 Its

resistance at 0 °𝐶 is

(a) 1 ohm

(b) 2 ohm

(c) 3 ohm

(d) 4 ohm

Answer: 4 ohm

8. The conductivity of a superconductor

is

(a) Infinite

(b) Very large

(c) Very small

(d) Zero

Answer: Infinite

9. Five cells each of internal resistance

0.2Ω and e.m.f. 2𝑉 are connected in series

with a resistance of 4 Ω. The current

through the external resistance is

(a) 0.2 𝐴

(b) 0.5 𝐴

(c) 1 𝐴

(d) 2 𝐴

Answer: 2 𝐴

10. Internal resistance of primary cell

depends on :-

(a) the nature of electrolyte

(b) the area of plates immersed in the

electrolyte

(c) the concentration of electrolyte and

distance between the plates

(d) all the above

Answer: all the above

11. In a Wheatstone’s network, 𝑃 = 2 Ω,

𝑄 = 2 Ω, 𝑅 = 2 Ω and 𝑆 = 3 Ω. The

resistance with which 𝑆 is to be shunted in

order that the bridge may be balanced is

(a) 1 Ω

(b) 2 Ω

(c) 4 Ω

(d) 6 Ω

Answer: 6 Ω

12. The terminal voltage is 𝐸/2 when a

current of 2 𝐴 is flowing through 2 Ω

resistance; the internal resistance of the

cell is :–

(a) 1 Ω

(b) 2 Ω

(c) 3 Ω

(d) 4 Ω

Answer: 2 Ω

13. In a Wheatstone bridge if the battery

and galvanometer are interchanged then

the deflection in galvanometer will

(a) change in previous direction

(b) not change

(c) change in opposite direction

(d) none of these.

Answer: not change

14.Three resistance of values 2Ω, 3Ω

and 6Ω are to be connected to yield and

effective resistance of 4Ω. This can be

done by connecting:

(a) 3Ω resistance in series with a

parallel combination of 2Ω and 6Ω

(b) 6Ω resistance in series with a

parallel combination of 2Ω and 3Ω

(c) 2Ω resistance in series with a

parallel combination of 3Ω and 6Ω

(d) 2Ω resistance in parallel with a

parallel combination of 3Ω and 6Ω

Answer: 2Ω resistance in series with a

parallel combination of 3Ω and 6Ω

15. 62.5 ×10^18 electrons per second are flowing through a

wire of area of cross-section 0.1 m2, the value of

current flowing will be _____.

(a) 1 A

(b) 0.1 A

(c) 10 A

(d) 0.11 A

Answer: 10 A

16. A steady current flows in a metallic conductor of nonuniform cross-section. The quantity/ quantities

constant along the length of the conductor is/are _____.

(a) Current, electric field and drift speed

(b) Drift speed only

(c) Current and drift speed

(d) Current only

Answer: Current only

17. The relaxation time in conductors _____.

(a) Increases with the increase of temperature

(b) Decreases with the increase of temperature

(c) It does not depend on temperature

(d)none

Answer: Increases with the increase of temperature

18. A potential difference of V is applied at the ends of a

copper wire of length and diameter. On doubling only

d, drift velocity _____.

(a) Becomes two times

(b) Becomes half

(c) Does not change

(d) Becomes one fourth

Answer: Does not change

19. If three resistance, 2Ω, 3Ω & 4Ω are connected in

parallel, then equivalent resistance is

(a) < 2Ω

(b) ≤ 2Ω

(c) > 2Ω

(d) ≥ 2Ω

Answer: > 2Ω

20. Which one of the following does not follow ohm’s law.

(a) Diode

(b) Transistor

(c) Thyristor

(d) All of these

Answer: All of these

21. A storage battery has e.m.f. 15 volts and internal resistance 0.05 ohm. Its terminal voltage when it is delivering 10 ampere is _____.

(a) 30 volts

(b) 1.00 volts

(c) 14.5 volts

(d) 15.5 volts

Answer: 14.5 volts

22. Then resistance in right and left gap of a meter bridge

is 20cm and 50cm respectively. If they are interchanged

then shift in position of balance point is

(a)22.84 cm

(b) 32.68 cm

(C) 42.86 cm

(d) 52.18 cm

Answer: 32.68 cm

23. Principle of working of meter-bridge is

(a) Unbalanced wheat stone bridge

(b) Balanced wheat stone bridge

(c) Potential drop is directing proportional length

(d) Both (b) & (c)

Answer: Unbalanced wheat stone bridge

24. Accuracy of metre-bridge is maximum when null

point is obtained

(a) In between 30cm – 70 cm

(b) In between 40cm – 60 cm

(c) In between 45cm – 55 cm

(d) Accuracy is same is all cases

Answer: Accuracy is same is all cases

25. Sensitivity of potentiometer can be increased by

(a) Increasing length of potentiometer wire

(b) Decreasing length of potentiometer wire

(c) Increasing emf of driver cell

(d) Both (1) &(2)

Answer: Decreasing length of potentiometer wire

26. A 4V ideal battery is

connected across a uniform wire

of length 10m. Two points on this wire, separated by

120 cm. The potential difference between these two points, is

(a) 6/25V

(b) 1/25V

(c) 9/25V

(d) None

Answer: 1/25V

We hope you liked our MCQs on Current Electricity Class 12 Physics Chapter 3.

Class 12 Chemistry Links:

Class 12 Physics Links: