Electromagnetism – Online MCQs – Physics 10th

1. A practical application of mutual induction is called:

generator

fuse

circuit breaker

transformer

2. The force F acting on the particle is directly proportional to the

velocity ‘v’

charge ‘q’ and velocity ‘v’

charge ‘q’

None of them

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

parallel to the field

perpendicular to the field

None of them

Both of these

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

zero

remains the same

minimum

maximum

5. There are _________ fundamental forces in nature.

three

five

four

two

6. Electric motors work on the principle of:

mutual induction

induction

electric couple

torque

7. The power is transmitted over long distances with high voltage to:

maximize the energy loss

minimize the energy loss

keep current constant

keep energy constant

8. Transformers are used to:

constant AC

increase and decrease AC

increase AC only

decrease AC only

9. Tesla is a unit of:

magnetic field strength

electromagnetic inductance

magnetic flux density

electromagnetic force

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

constant

zero

decreased

increased

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

antiparallel to the field

parallel to the field

dipole moment is perpendicular to the field

parallel and antiparallel to the field

12. The earth’s magnetic field is:

500 µT

500 T

50 T

50 µT

13. The number of coils in a transformer is:

four

one

three

two

14. The electric power delivered to the secondary circuit is equal to the power supplied to the primary circuit is a/an:

step-up transformer

ideal transformer

step-down transformer

electric motor

15. If we had a wire with the right hand such that the thumb pointed in the direction of the current, then the curling fingers of the hand will point the:

None of above

force

magnetic field

voltage

16. 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.

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

electrical energy into mechanical energy

mechanical energy into electrical energy

mechanical energy into chemical energy

electrical energy into chemical energy

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

From side to side

From south pole to north pole

From north pole to south pole

There are no magnetic field lines

19. A conductor of length L has current I passing through it when it is placed parallel to a magnetic field. The force experienced by the conductor will be:

zero

BIL

BIL²

B²IL

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

step up transformer

voltage transformer

ideal transformer

step down transformer

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