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ECAT Physics Electromagnetic Induction Test Online

Danial MalikLast Updated: April 18, 2025

Physics Electromagnetic Induction MCQS Online Test

ECAT Physics Electromagnetic Induction Chapter Online Test

Total Questions:	56
Time Allowed:	25 Minutes
Total Marks:	56
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	ECAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

Page 1 of 3

1. A jet plane is flying horizontally at a speed of 1800 km/hour. What is the potential difference developed between the tips of its wings if the wing span is 25m? Earth’s magnetic field at the location is 0.4 gauss and the angle of dip is 30°.

25mV

250mV

500mV

2.5V

2. Current produced by moving the loop of wire across a magnetic field is called

A.C current

D.C current

Induced current

Mean square current

3. A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is

0 volt

3.125 volt

31.25 volt

0.03125 volt

4. The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to

Magnetic flux density

Torque

Mutual induction

Motional emf

5. emf induced in a circuit according to Faradays law depends on the

Maximum magnetic flux

Rate of change of magnetic flux

Change in magnetic flux

Initial magnetic flux

6. The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as

Joule’s Law

Faraday’s law

Ohm’s Law

Coulomb’s Law

7. Lenz’s law is a consequence of the law of conservation of

Linear momentum

Charge

Angular momentum

Energy

8. Lenz’s law states that the direction of the induced emf and hence current

Is determined by the rate of current flux

Is found by the right hand rule

Is found by the left hand rule

Always opposes the cause producing it

9. The practical illustration of the phenomenon of mutual induction is

A.C generator

D.C dynamo

Induction coil

Transformer

10. The process by which an emf and hence current is generated or induced in a conductor when there is a change in the magnetic flux linking the conductor is called

Electromagnetic induction

Mutual induction

Faraday’s law

Electromagnetic interference

11. When the d.c. motor may overloaded beyond its limits the motor may be burnt due to

Low voltage

Heavy current

High voltage

None of these

12. In transformer, if the resistance of the coil is negligible them

Back emf is equal to applied voltage

Back emf is equal and opposite to applied voltage

Back emf is less than applied voltage

None of these

13. Where the several secondasries the transformer are used for different voltages is required?

Television

Radio

Computer monitors

All of these

14. In order to improve the efficiency of the transformer

Core pieces should be laminated

Hysteresis loop is of small area

Wire should be of pure copper

All of these

15. The emf produce by motion of a coil across a magnetic field is called

Induced emf

Self-induced emf

Motional emf

Emf

16. The lenz’s law hold in case of induced

Current

Voltage

Emf

All of these

17. Lamination of core of a transformer is to decrease is

Eddy current loss

Hystersis

Electrical resistance

Inductance

18. Slip rings are used in the device

A.C. motor

D.C. motor

A.C. generator

All of these

19. Multiple coils are wound around a cylindrical core to form the

D.C. motor

Galvanometer

Armature

Generator

20. “Load” is are the device/devices which consume

Mechanical energy

Electrical energy

Frictional energy

None of these

21. The field coils on the armature coils are connected in

Series

Parallel

Series or parallel

None of these

22. When the motor is just start back emf is

Zero

Almost zero

Maximum

None of these

23. To enhance the magnetic flux, the primary and secondary coils are wound on

Air cored

Steel cored

Wooden cored

Soft iron cored

24. When a metallic and glass pots are put over a heater the metallic pot heated up earlier due to the

Resistance

Voltage is generated

Current is generated

None of these

25. The direction of induced emf is such as to oppose the cause producing it. Comment on this statement

Faraday’s law

Gauss’s law

Lenz’s law

None of these

Page 2 of 3

26. A transformer is a device which

Steps up A.C. voltage

Steps down

Steps up energy

A and B

27. The power dissipation in the transformer is due to

Current

Voltage

Eddy currents

All of these

28. To minimize all the power losses, the material of lamina should be of

Steel

Nickel

Soft iron

Cobalt

29. Which quantity is increased in step-down transformer?

Current

Voltage

Power

Frequency

30. The average power dissipation in a pure capacitor in AC circuit is

½ CV²

CV²

2CV²

Zero

31. Quantity that remains unchanged in a transformer is

Voltage

Current

Frequency

None of these

32. The direction of induced current is such that it opposes the very cause that has produced it. This is the law of

Lenz

Faraday

Kirchoff

Fleming

33. A particle is moving is a uniform magnetic field, then

Its momentum changes but total energy remains the same

Both momentum and total energy remains the same

Both changes

Total energy change but momentum remains

34. A transformer works on the principle of

Convertor

Invertor

Mutual induction

Self-induction

35. According to Maxwell’s hypothesis a changing electric field gives rise to

An e.m.f.

Electric current

Magnetic field

Pressure radiant

36. Current in an inductance of 1 mH is reduced from 5 A to 0 in 1 ms. The e.m.f. induced in it is (in V):

1/5

10¯⁵

37. For high frequency, capacitor offers

More resistance

Less resistance

Zero resistance

None of these

38. In an A.C. circuit, the current lags behind the voltage by π/3. The components in the circuit are

R and L

L and C

R and C

Only R

39. The core of a transformer is laminated so that

The ratio of the voltage in the secondary to that in the primary may be increased

The weight of the transformer may be reduced

Energy losses due to eddy currents may be minimized

Rusting of the core may be prevented

40. The number of turns in the coil are doubled, the emf will get

Doubled

Halved

Quadrupled

None of these

41. When a magnet is moved with its north pole toward a coil placed in a closed circuit, then the nearest face of the coil

Shows south polarity

Shows north polarity

Shows no polarity

Shows sometimes north and sometimes south polarity

42. Alternating current is transmitted to distant places

At high voltage and low current

At high voltage and high current

At low voltage and low current

At low voltage and high current

43. A capacitor is perfectly insulator for

Direct current

Alternating current

Direct as well as alternating current

None of these

44. The average power dissipated in a pure inductor of inductance L is

LI²/2

LI²

LI²/4

Zero

45. The electromagnetic waves travel with a velocity

Equal to velocity of sound

Equal to velocity of light

Less than velocity of light

None of these

46. The velocity of electromagnetic wave is parallel to

B x E

E X B

47. Eddy current is produced when

A metal is kept in varying magnetic field

A metal is kept in the steady magnetic field

A circular coil is placed in a magnetic field

Through a circular coil, current is passed

48. The energy stored in an inductor is

Electrostatic

Electromagnetic

Magnetic

Mechanical

49. The peak value of AC voltage on a 220 V mains is:

240 √2 V

230 √2 V

220 √2 V

200 √2 V

50. Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon:

The currents in the two coils

The rates at which currents are changing in the two coils

Relative position and orientation of the two coils

The materials of the wires of the coils

Page 3 of 3

51. The core of any transformer is laminated so as to

Increase the secondary voltage

Reduce the energy loss due to eddy currents

Make it light weight

Make it or bust and strong

52. Alternating current instead of direct current is used in long distance electric transmission because

It is easy to generate

Rectification is possible

Energy losses are minimum

It causes fewer accidents

53. Eddy currents are used in

Induction furnace only

Electromagnetic brakes only

Speedometers only

All of these

54. Which scientist experimentally proved the existence of electromagnetic waves?

Sir. J. C. Bose

Maxwell

Marconi

Hertz

55. Radio frequency choke uses core of

Air

Iron

Air and iron

None of these

56. The phase difference between the current and voltage at resonance is

π/2

- π

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Danial MalikLast Updated: April 18, 2025

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ECAT Physics Electromagnetic Induction Test Online

Physics Electromagnetic Induction MCQS Online Test

ECAT Physics Electromagnetic Induction Chapter Online Test

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Danial Malik

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Physics Electromagnetic Induction MCQS Online Test

ECAT Physics Electromagnetic Induction Chapter Online Test

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Danial Malik

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