10th class Physics, Chapter 16: Electricity MCQs

1. The direction of conventional current is:

1. (A) from negative to positive terminal
2. (B) from positive to negative terminal ✓
3. (C) in both directions at the same time
4. (D) it does not have a fixed direction

2. What type of electric current flows in one direction only?

1. (A) Alternating current
2. (B) Direct current ✓
3. (C) Induced current
4. (D) None of these

3. The device used to measure electric current:

1. (A) voltmeter
2. (B) ammeter ✓
3. (C) ohmmeter
4. (D) wattmeter

4. What is the function of an electromotive force (e.m.f.) source in a circuit?

1. (A) To reduce resistance in the circuit
2. (B) To provide energy to drive charges through the circuit ✓
3. (C) To store electrical energy for later use
4. (D) To convert electrical energy into mechanical energy

5. The relationship between voltage, current, and resistance is:

1. (A) V = I R ✓
2. (B) V = I / R
3. (C) V = I² R
4. (D) V = R / I

6. What happens to the resistance of a metal conductor when its temperature increases?

1. (A) It decreases
2. (B) It remains constant
3. (C) It increases ✓
4. (D) It becomes zero

7. One ampere is equal to:

1. (A) one joule per coulomb
2. (B) one volt per ohm second
3. (C) one watt per second
4. (D) one coulomb per second ✓

8. Electrons in a circuit move:

1. (A) in both directions
2. (B) only in the battery
3. (C) from negative to positive terminal ✓
4. (D) from positive to negative terminal

9. The frequency of A.C supplied in our country is:

1. (A) 25 Hz
2. (B) 50 Hz ✓
3. (C) 60 Hz
4. (D) 100 Hz

10. A battery provides:

1. (A) eddy current
2. (B) direct current ✓
3. (C) alternating current
4. (D) induced current

11. A.C changes its direction after every:

1. (A) 1 second
2. (B) 50 seconds
3. (C) 1/100 second
4. (D) 1/50 second ✓

12. An ammeter is always connected in:

1. (A) parallel
2. (B) series-parallel
3. (C) any manner
4. (D) series ✓

13. An analog ammeter works on the effect of the current that produces:

1. (A) a magnetic field ✓
2. (B) heat only
3. (C) light
4. (D) sound

14. A generator converts:

1. (A) thermal energy into electrical energy
2. (B) electrical energy into mechanical energy
3. (C) mechanical energy into electrical energy ✓
4. (D) chemical energy into electrical energy

15. A battery converts:

1. (A) heat into electrical energy
2. (B) light into electrical energy
3. (C) chemical energy into electrical energy ✓
4. (D) mechanical energy into electrical energy

16. The SI unit of potential difference is:

1. (A) volt ✓
2. (B) ampere
3. (C) ohm
4. (D) watt

17. A voltmeter is connected in:

1. (A) any manner
2. (B) parallel with the component ✓
3. (C) series with the component
4. (D) series with the battery

18. Three identical 5 V cells are connected in parallel. The total e.m.f. of the combination is:

1. (A) 1.67 V
2. (B) 0 V
3. (C) 5 V ✓
4. (D) 15 V

19. Three 1.5 V cells connected in series give a total e.m.f. of:

1. (A) 4.5 V ✓
2. (B) 1.5 V
3. (C) 0.5 V
4. (D) 3 V

20. The SI unit of resistance is:

1. (A) ohm ✓
2. (B) ampere
3. (C) volt
4. (D) watt