Electromagnetism – Online MCQs – Physics 10th

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

charge at rest

Both of them

None of them

charge in motion

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

the cross product of the magnetic moment and field vector

the cross product of the field vector and magnetic moment

the dot product of the magnetic moment and field vector

the dot product of the field vector and magnetic moment

3. Tesla is a unit of:

magnetic flux density

electromagnetic inductance

electromagnetic force

magnetic field strength

4. Tesla is equivalent to one:

meter / Weber

Weber / meter

Weber / meter²

Weber

5. Fleming’s left-hand rule is used to find:

the direction of the force on a current carrying conductor in a magnetic field

direction of flux in a coil

magnetic flux density

the direction of the magnetic field due to a current carrying conductor

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

V_s = 10 V_p

N_p = 10 N_s

N_s = 10 N_s

I_s = 10 I_p

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

resistance of the coil

number of turns of the coil

area of the cross-section of the coil

motion of the magnet

8. 1 Tesla = _________________

10² Gauss

10^-2 Gauss

10⁴ Gauss

10^-4 Gauss

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

Strong nuclear force

Gravity

Weak nuclear force

Electromagnetic force

10. Transformers are used to:

constant AC

increase and decrease AC

increase AC only

decrease AC only

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

remains the same

will be zero

decreases

increases

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

torque acting on the coil

electric field acting on the coil

current acting on the coil

voltage acting on the coil

13. At the generating station, the AC voltage is:

stepped down

kept constant

None of above

stepped up

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

ideal transformer

step-up transformer

electric motor

step-down transformer

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

increased

decreased

zero

constant

16. The earth’s magnetic field is:

500 T

50 T

50 µT

500 µT

17. The induced emf of a coil is directly proportional to:

Both of these

the total number of turns in the coil & the area of cross-section of the coil

None of them

the strength of the magnetic field & the angular velocity of the coil

18. 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

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

voltage transformer

step down transformer

ideal transformer

step up transformer

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

vector quantity

scalar quantity

tensor quantity

neutral quantity

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