Electromagnetism – Online MCQs – Physics 10th

1. Electric motors work on the principle of:

induction

torque

mutual induction

electric couple

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

electric field acting on the coil

voltage acting on the coil

torque acting on the coil

current acting on the coil

3. 1 Tesla = _________________

10^-2 Gauss

10² Gauss

10^-4 Gauss

10⁴ Gauss

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

stabilizer

transformer

motor

generator

5. If the secondary voltage is lower than the primary voltage, the transformer is called a:

ideal transformer

step down transformer

step up transformer

voltage transformer

6. The force that attracts matter across long distances.

Gravity

Strong nuclear force

Electromagnetic force

Weak nuclear force

7. The earth’s magnetic field is:

500 µT

500 T

50 T

50 µT

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

right hand thumb rule

Fleming’s left-hand rule

Fleming’s right-hand rule

left hand thumb rule

9. The turn ratio of a transformer is 10. It means:

I_s = 10 I_p

V_s = 10 V_p

N_p = 10 N_s

N_s = 10 N_s

10. A magnetic compass shows deflection if it is kept near a:

None of them

charge in motion

charge at rest

Both of them

11. Two parallel wires carrying currents in opposite directions:

cancel out magnetic fields of each other

repel each other

attract each other

not affect each other

12. The magnetic field is the strongest:

near the poles

at the centre

Bothe of these

None of these

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

ideal transformer

step down transformer

voltage transformer

step up transformer

14. 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:

BIL

B²IL

zero

BIL²

15. A magnetic field:

always exerts a force on a charged particle

exerts a force if the charged particle is moving perpendicular to the magnetic field lines

Never exerts a force on a charged particle

exerts a force if the charged particle is moving in the direction of the magnetic field lines

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

remains the same

increases

decreases

will be zero

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

mechanical field

magnetic field

electric field

electromagnetic field

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

constant

increased

zero

decreased

19. The step-up transformer:

has more turns in the primary

increases the input current

has fewer turns in the secondary coil

increases the input voltage

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

motion of the magnet

area of the cross-section of the coil

number of turns of the coil

resistance of the coil

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