Current Electricity – Online MCQs – Physics 10th

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

resistance must be wire wound type

temperature should remain constant

current should be proportional to voltage

All of the above

2. When a charge moves through a potential difference,

electrical work is done and but energy does not transfer

electrical work is not done and but energy is transferred

neither electric work is done nor energy transferred

electrical work is done and energy transferred

3. Conductance is reciprocal of:

current

resistance

permittivity of free space

capacitance

4. Volts is denoted by:

volt = Joule (J) / Coulomb

volt = Newton (N) / Coulomb (C)

volt = Coulomb (C) / Joule

volt = Coulomb (C) / Newton (N)

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

the voltage through each resistance is the same

neither current nor voltage through each resistance is the same

both current and voltage through each resistance are the same

the current through each resistance is the same

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

thermistors and crystal rectifiers

Both of these

vacuum tubes and diodes

None of these

7. It is an electrical component that converts one form of energy int another form of energy.

LDR

Battery

Resistor

Transducer

8. Which statement is TRUE for an electric current?

it always obeys the law of vector addition.

It sometimes obeys the law of vector addition

it does not obey the law of vector addition

It does not have a direction

9. S.I unit of EMF is:

J / C

volt

ampere

statvolt

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

H = IR²t

H = IRt²

H = I²Rt

H = IRt

11. Current is a:

tensor quantity

vector quantity

scalar quantity

None of them

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

series

none of these

mixed

parallel

13. Which statement is TRUE for the direct current?

magnitude and direction of current remain constant

magnitude and direction of current changes with time

the magnitude of current changes with time

the direction of current changes with time

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

conductivity

inductance

resistance

capacitance

15. Resistance of a conductor does not depend on:

length of the conductor

resistivity

area of cross section

density

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

I α V

I α (1/V)

I α (1/R)

I α R

17. In an electric circuit when electrons move from low to the high potential they will:

gain energy

lose their identity

lose energy

gain potential

18. Most power stations in our country produce:

conventional current

None of them

direct current

alternating current

19. Which of the following statements is TRUE?

A galvanometer with high resistance in series is an ammeter

A galvanometer with high resistance in parallel is a voltmeter

A galvanometer with low resistance in parallel is a voltmeter

A galvanometer with low resistance in series is an ammeter

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

halved

doubled

zero

the same

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