Current Electricity – Online MCQs – Physics 10th

1. The condition for the validity of Ohm’s law is that the:

current should be proportional to voltage

resistance must be wire wound type

temperature should remain constant

All of the above

2. The length of g conductor is halved. Its resistance will be:

the same

doubled

zero

halved

3. An instrument which detects electric current is known as:

resistor

voltmeter

transducer

galvanometer

4. If the temperature of a metallic conductor increases, electrical resistance will:

become zero

increase

remain the same

decrease

5. The ratio between the voltage applied to the current flowing through a circuit is called:

conductance

inductance

capacitance

resistance

6. AC changes direction every:

1/20 second

1/40 second

1/50 second

1/25 second

7. potential difference is measure in:

ampere

volt

N/C

Coulomb

8. Heat produced in a conductor can be calculated by Joule’s heat law:

H = I²Rt

H = IRt

H = IRt²

H = IR²t

9. In the series combination of two or more resistances:

both current and voltage through each resistance are the same

the voltage through each resistance is the same

the current through each resistance is the same

neither current nor voltage through each resistance is the same

10. Which one of these is an example of non-ohmic devices?

vacuum tubes and diodes

thermistors and crystal rectifiers

None of these

Both of these

11. Reciprocal of resistivity is called:

capacitance

resistance

current

conductivity

12. If we turn the TV volume down, we’re actually turning up the:

conductivity

resistance

capacitance

inductance

13. Motion of any charge moving from one point to another point is Called:

electric intensity

electromotive force

current

potential difference

14. An electric current is always considered as the flow of:

All of them

positive charge of the conductor

negative charges of the conductor

neutral particles of the conductor

15. In an electric circuit a voltmeter is always connected in:

mixed

none of these

series

parallel

16. When a charge moves through a potential difference,

electrical work is not done and but energy is transferred

electrical work is done and but energy does not transfer

neither electric work is done nor energy transferred

electrical work is done and energy transferred

17. Which of the following is the purpose of connecting a battery in an electric circuit?

To vary the resistance across the conductor

To maintain a constant potential difference across the conductor

To maintain resistance across the conductor

To maintain a varying potential difference across the conductor

18. The resistance of a wire on increasing its temperature will be:

the same

decreased with a rise in temperature

increased with a rise in temperature

zero

19. It is the rate of the transfer of energy:

capacitance

current

electrical power

potential difference

20. Which of the following is NOT equivalent to watt?

amperes/volt

joules/sec

amperes x volts

amperes x ohm

Online MCQs Test | Unit 15 : Current Electricity | Physics Class 10th | Sindh Board Science Group