Electromagnetism – Online MCQs – Physics 10th

1. An ideal transformer dissipates by itself:

high power

low power

None of above

no power

2. 1 Tesla = _________________

10² Gauss

10^-4 Gauss

10⁴ Gauss

10^-2 Gauss

3. Which statement is NOT TRUE for transformers?

It operates on a DC supply.

They are used for transforming power from one circuit to another without changing the frequency.

They consist of two coils which are magnetically linked to each other but electrically isolated from one another.

They operate based on the principle of mutual induction.

4. When a coil rotated in a magnetic field the induced current in it:

becomes zero

continuously changes

remains same

becomes maximum

5. At the centre, the magnetic field is:

weakest

zero

None of them

strongest

6. In the transformer, if the secondary voltage is more than the primary voltage then it is called:

step down transformer

voltage transformer

step up transformer

ideal transformer

7. The magnetic field direction around a current-carrying conductor can be determined using the Flemings

left hand rule

none of these

right and left hand rule

right hand rule

8. What is the direction of the magnetic field lines inside a bar magnet?

From north pole to south pole

From side to side

From south pole to north pole

There are no magnetic field lines

9. As per Michael Faraday, the force is increased if the:

length of wire increased

magnetic field’s strength increased

All of above

current in the wire is increased

10. If the current in a wire is placed perpendicular to a magnetic field _________ the force on the wire:

increases

remains the same

decreases

will be zero

11. We apply Lenz’s law to find out the direction of:

magnetic field

current induced in a circuit

electromagnetic induction

electric field

12. The direction of induced e.m.f. in a circuit is in accordance with the conservation of:

energy

momentum

mass

charge

13. A D.C motor converts:

electrical energy into mechanical energy

electrical energy into chemical energy

mechanical energy into chemical energy

mechanical energy into electrical energy

14. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon:

area of the cross-section of the coil

resistance of the coil

number of turns of the coil

motion of the magnet

15. To increase or decrease AC voltages, we use:

generator

motor

stabilizer

transformer

16. The force that attracts matter across long distances.

Strong nuclear force

Weak nuclear force

Gravity

Electromagnetic force

17. An AC generator is an electric generator that converts:

electrical energy into mechanical energy

mechanical energy into chemical energy

mechanical energy into electrical energy

electrical energy into chemical energy

18. A current carrying coil kept in a magnetic field experiences a torque which is maximum when the:

dipole moment is perpendicular to the field

parallel to the field

antiparallel to the field

parallel and antiparallel to the field

19. The magnetic field is the strongest:

at the centre

Bothe of these

near the poles

None of these

20. When current flowing upward direction it indicated the:

None of them

south and north pole

north pole

south pole

Online MCQs Test | Unit 16 : Electromagnetism | Physics Class 10th | Sindh Board Science Group