Electromagnetism – Online MCQs – Physics 10th

1. When a current passes through a conductor, it produces:

electric field

mechanical field

electromagnetic field

magnetic field

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

Faraday

William Sturgeon

Lenz

Joseph Henery

3. Electric motors work on the principle of:

electric couple

torque

mutual induction

induction

4. There are _________ fundamental forces in nature.

three

two

four

five

5. The magnetic field is the strongest:

None of these

Bothe of these

near the poles

at the centre

6. 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

7. If the secondary voltage exceeds the primary voltage, the transformer is called a:

step-down transformer

positive transformer

negative transformer

step-up transformer

8. It is responsible for forcing positively charged atomic nuclei to attract negatively charged electrons.

Electromagnetic force

Strong nuclear force

Gravity

Weak nuclear force

9. Which statement is NOT TRUE for transformers?

They operate based on the principle of mutual induction.

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

It operates on a DC supply.

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

10. 1 Tesla = _________________

10^-4 Gauss

10⁴ Gauss

10² Gauss

10^-2 Gauss

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

stationary positive charge

stationary negative charge

magnetic compass

small mass

12. Transformers are used to:

decrease AC only

increase and decrease AC

increase AC only

constant AC

13. The earth’s magnetic field is:

500 µT

50 µT

50 T

500 T

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

will be zero

decreases

increases

remains the same

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

the dot product of the magnetic moment and field vector

the cross product of the field vector and magnetic moment

the cross product of the magnetic moment and field vector

the dot product of the field vector and magnetic moment

16. The number of coils in a transformer is:

four

one

two

three

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

From north pole to south pole

From side to side

There are no magnetic field lines

From south pole to north pole

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

generator

transformer

motor

stabilizer

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

right hand thumb rule

Fleming’s right-hand rule

Fleming’s left-hand rule

left hand thumb rule

20. The force that attracts matter across long distances.

Gravity

Weak nuclear force

Electromagnetic force

Strong nuclear force

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