Electromagnetism – Online MCQs – Physics 10th

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

current in the wire is increased

All of above

length of wire increased

magnetic field’s strength increased

2. 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.

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

It operates on a DC supply.

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

mechanical field

electromagnetic field

electric field

magnetic field

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

Weak nuclear force

Strong nuclear force

Gravity

Electromagnetic force

5. An ideal transformer dissipates by itself:

no power

high power

low power

None of above

6. When electric charges are at rest, they exert:

strong nuclear force

electromagnetic force

weak nuclear force

electrostatic force

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

vector quantity

scalar quantity

neutral quantity

tensor quantity

8. Magnetic effect of current is called:

electric field

magnetism

induction

electromagnetism

9. Electric motors work on the principle of:

mutual induction

induction

electric couple

torque

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

There are no magnetic field lines

From south pole to north pole

From side to side

From north pole to south pole

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

stabilizer

motor

generator

transformer

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

will be zero

increases

remains the same

decreases

13. The magnetic field is the strongest:

Bothe of these

near the poles

None of these

at the centre

14. The earth’s magnetic field is:

50 T

500 µT

500 T

50 µT

15. Two parallel wires carrying currents in opposite directions:

not affect each other

attract each other

cancel out magnetic fields of each other

repel each other

16. The number of coils in a transformer is:

one

three

two

four

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

None of them

velocity ‘v’

charge ‘q’ and velocity ‘v’

charge ‘q’

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

step up transformer

voltage transformer

step down transformer

ideal transformer

19. 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 cross product of the magnetic moment and field vector

the dot product of the magnetic moment and field vector

the dot product of the field vector and magnetic moment

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

negative transformer

step-down transformer

positive transformer

step-up transformer

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