Electromagnetism – Online MCQs – Physics 10th

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

becomes zero

remains same

continuously changes

becomes maximum

2. When the plane of the coil is parallel to magnetic field, the induced e.m.f is:

remains the same

zero

maximum

minimum

3. The direction of induced current in a circuit is always such that it opposes the cause that produces it. This law was presented by:

Joseph Henery

William Sturgeon

Faraday

Lenz

4. The current-carrying loop inside the magnetic field rotate due to the:

electric field acting on the coil

torque acting on the coil

voltage acting on the coil

current acting on the coil

5. Which statement is NOT TRUE for transformers?

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

It operates on a DC supply.

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.

6. The force that attracts matter across long distances.

Electromagnetic force

Gravity

Strong nuclear force

Weak nuclear force

7. The magnetic field is the strongest:

None of these

at the centre

Bothe of these

near the poles

8. 1 Tesla = _________________

10⁴ Gauss

10² Gauss

10^-4 Gauss

10^-2 Gauss

9. In the MKS system, the unit of magnetic flux density is:

Ampere

Coulomb

Weber

Tesla

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

current induced in a circuit

electromagnetic induction

magnetic field

electric field

11. A current carrying coil kept in a magnetic field, experiences a torque, which is the:

the cross product of the field vector and magnetic moment

the dot product of the field vector and magnetic moment

the cross product of the magnetic moment and field vector

the dot product of the magnetic moment and field vector

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

decreases

remains the same

will be zero

increases

13. The magnetic field around a magnetic moving charge is a:

tensor quantity

neutral quantity

scalar quantity

vector quantity

14. The magnetic force experienced by a charged particle moving in a magnetic field will be minimum when it moves:

parallel to the field

Both of these

None of them

perpendicular to the field

15. The direction of the induced current is given by:

Fleming’s right-hand rule

Fleming’s left-hand rule

left hand thumb rule

right hand thumb rule

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

All of above

magnetic field’s strength increased

current in the wire is increased

length of wire increased

17. A practical application of mutual induction is called:

circuit breaker

generator

transformer

fuse

18. The presence of a magnetic field can be detected by a:

stationary negative charge

stationary positive charge

magnetic compass

small mass

19. If we increase the number of loops, the turning effect of a coil would be:

increased

constant

decreased

zero

20. An ideal transformer dissipates by itself:

None of above

low power

high power

no power

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