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Class 10

Explore popular questions from Electricity for Class 10. This collection covers Electricity previous year Class 10 questions hand picked by experienced teachers.

Electricity

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Q 1. Three resistances of {tex}2, 3{/tex} and {tex}5{/tex} {tex} \Omega {/tex} are connected in parallel to a {tex}10{/tex} {tex}\mathrm{V}{/tex} battery of negligible internal resistance. The potential difference across the 3 {tex} \Omega {/tex} resistance will be :

A

2 V

B

3 V

C

5 V

10 V

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Q 2. Charge on an electron is {tex}1.6 \times 10^{-19}{/tex} coulomb. Number of electrons passing through the wire per second on flowing of {tex}1{/tex} ampere current through the wire will be :

A

{tex}0.625 \times 10^{-19}{/tex}

B

{tex}1.3 \times 10^{-19}{/tex}

C

{tex}1.6 \times 10^{-19}{/tex}

{tex}0.625 \times 10^{19}{/tex}

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Q 3. Three resistors are connected to form the sides of a triangle ABC as shown below.

The resistance of side AB is 40 ohms, of side BC 60 ohms and of side CA 100 ohms. The effective resistance between A and B will be :

A

50{tex} \Omega {/tex}

B

64{tex} \Omega {/tex}

32{tex} \Omega {/tex}

D

100{tex} \Omega {/tex}

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Q 4. In the circuit shown in the figure, the current through

A

The 3 {tex} \Omega {/tex} resistor is 0.50A

B

The 3 {tex} \Omega {/tex} resistor is 0.25A

C

The 4 {tex} \Omega {/tex} resistor is 0.50A

The 4 {tex} \Omega {/tex} resistor is 0.25A

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Q 5. Which of the circuit components in the following circuit diagram and connected in parallel?

A

R{tex}_1{/tex} and R{tex}_2{/tex} only

R{tex}_1{/tex} , R{tex}_2{/tex} and V

C

R{tex}_2{/tex} and V only

D

R{tex}_1{/tex} and V only

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Q 6. A cylindrical rod is reformed to twice its length with no change in its volume. If the resistance of the rod was R, the new resistance will be :

A

R

B

2 R

4 R

D

8 R

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Q 7. A wire carries a steady current of 1.0A over a period of 20s. What total charge passes through the wire in this time interval :

A

200 C

20 C

C

2.0 C

D

0.20 C

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Q 8. The length of a wire is doubled and the radius is doubled. By what factor does the resistance change:

A

4 times as large

B

twice as large

C

unchanged

half as large

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Q 9. A 24 V potential difference is applied across a parallel combination of four 6 ohm resistor. The current in each resistor is :

A

1 A

4 A

C

16 A

D

36 A

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Q 10. You are given n identical wires, each of resistance R. When these are connected in parallel, the equivalent resistance is X. When these will be connected in series, then the equivalent resistance will be :

A

{tex}\mathrm {X/n^2}{/tex}

{tex}\mathrm {n^2X}{/tex}

C

{tex}\mathrm {X/n}{/tex}

D

{tex}\mathrm {nX}{/tex}

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Q 11. Three resistors of 4.0{tex} \Omega {/tex}, 6.0{tex} \Omega {/tex} and 10.0{tex} \Omega {/tex} are connected in series. What is their equivalent resistance :

20 {tex} \Omega {/tex}

B

5 {tex} \Omega {/tex}

C

6.0 {tex} \Omega {/tex}

D

4.0 {tex} \Omega {/tex}

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Q 12. Ampere-second stands for the unit of :

A

Power

Charge

C

e.m.f.

D

Energy

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Q 13. If one micro-amp. current is flowing in a wire, the number of electrons which pass from one end of the wire to the other end in one second is :

{tex}6.25 \times 10^{12}{/tex}

B

{tex}6.25 \times 10^{15}{/tex}

C

{tex}6.25 \times 10^{18}{/tex}

D

{tex}6.25 \times 10^{19}{/tex}

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Q 14. If the temperature of a conductor is increased, its resistance will :

A

Not increase

Increase

C

Decrease

D

Change according to the whether

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Q 15. There are two wires of the same length and of the same material and radius r and 2r. The ratio of their specific resistance is :

A

1 : 2

1 : 1

C

1 : 4

D

4 : 1

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Q 16. The resistance 4 R, 16 R, 64 R, .......... {tex} \infty {/tex} are connected in series, their resultant will be :

A

0

{tex} \infty {/tex}

C

43 R

D

34 R

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Q 17. Resistance R, 2R, 4R, 8R, {tex} \infty {/tex} are connected in parallel. Their resultant resistance will be :

A

R

R/2

C

0

D

{tex} \infty {/tex}

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Q 18. The equivalent resistance between points X & Y:

A

5 {tex} \Omega {/tex}

B

10 {tex} \Omega {/tex}

15 {tex} \Omega {/tex}

D

60 {tex} \Omega {/tex}

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Q 19. The equivalent resistance between points X & Y:

A

4 {tex} \Omega {/tex}

4.5 {tex} \Omega {/tex}

C

2 {tex} \Omega {/tex}

D

20 {tex} \Omega {/tex}

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Q 20. A certain wire has a resistance R. The resistance of another wire identical with the first except having twice its diameter is :

A

2 R

0.25 R

C

4 R

D

0.5 R

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Q 21. Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their lengths are in the 3 : 2 : 1. The electrical resistances are in ratio :

A

1 : 4 : 9

B

9 : 4 : 1

C

1 : 2 : 3

27 : 6 : 1

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Q 22. A solenoid is at potential difference 60 V and current flows through it is 15 ampere, then the resistance of coil will be :

4 {tex} \Omega {/tex}

B

8 {tex} \Omega {/tex}

C

0.25 {tex} \Omega{/tex}

D

2 {tex} \Omega {/tex}

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Q 23. Which of the following has a negative temperature coefficient?

C

B

Fe

C

Mn

D

Ag

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Q 24. To determine the equivalent resistance of two resistors when connected in series, a student arranged the circuit components as shown in the diagram. But he did not succeed to achieve the objective.

Which of the following mistakes has been committed by him in setting up the circuit?

A

Position of ammeter is incorrect.

B

Position of voltmeter is incorrect.

Terminals of ammeter are wrongly connected.

D

Terminals of voltmeter are wrongly connected.

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Q 25. The following circuit diagram shows the experimental set-up for the study of dependence of current on potential difference. Which two circuit components are connected in series?

A

Battery and voltmeter

B

Ammeter and voltmeter

Ammeter and Rheostat

D

Resistor and voltmeter