Current Electricity – Online MCQs – Physics 10th

1. Joule’s Law state that the rate at which heat is produced by a steady current in any part of an electric circuit is jointly proportional to the resistance and the square of the:

capacitance

potential difference

current

resistance

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

vacuum tubes and diodes

Both of these

None of these

thermistors and crystal rectifiers

3. AC changes direction every:

1/20 second

1/40 second

1/25 second

1/50 second

4. Energy dissipated = ______________

VIt

both of these

I²Rt

None of these

5. In a centimetre-gram-second (CCS) system the unit of EMF is:

ampere

statvolt

volt

J / C

6. A galvanometer can be converted into a voltmeter _________ with the galvanometer.

a low shunt resistance in series

a low shunt resistance in parallel

high resistance in series

high resistance in parallel

7. Mathematically Ohm’s law can be written as:

I α V

I α (1/R)

I α R

I α (1/V)

8. When a current flows through a resistor, electrical energy is convened into:

sound energy

chemical energy

light energy

heat energy

9. Which statement is TRUE for the conductance of a conductor (K)?

Its unit is Ohm (Ω) and it is equal to 1/R.

Its unit is the Ohm (Ω) and it is equal to R.

Its unit is mho (Q^–1) and it is equal to 1/R.

Its unit is mho (Ω^–1) and it is equal to R.

10. 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

11. The current we get from a battery is a/an:

alternating current

direct and alternative current

None of them

direct current

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

zero

the same

decreased with a rise in temperature

increased with a rise in temperature

13. Two resistances of 6 Ω and 12 Ω are connected in parallel. Their net resistance is:

50 Ω

7 Ω

6 Ω

60 Ω

14. Electrical power is measured in units of:

watts

joules

heat energy

chemical energy

15. Which statement is TRUE for an electric current?

it always obeys the law of vector addition.

It does not have a direction

It sometimes obeys the law of vector addition

it does not obey the law of vector addition

16. Ohm’s law can be applied directly to:

None of them

capacitor and inductor circuits

capacitor circuits

inductor circuits

17. Reciprocal of resistivity is called:

conductivity

resistance

current

capacitance

18. The (K) in Ohm’s law (I = KV) indicated the:

None of these

conductance

resistance

Coulomb’s constant

19. Volts is denoted by:

volt = Joule (J) / Coulomb

volt = Coulomb (C) / Newton (N)

volt = Coulomb (C) / Joule

volt = Newton (N) / Coulomb (C)

20. A current that always flows in one direction only is called:

alternating current

direct current

conventional current

None of them

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