Physics Electromagnetic Induction Online Mcqs Test

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Question 1

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°.

Question 2

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

Answer

A.C current

Answer

D.C current

Answer

Induced current

Answer

Mean square current

Question 3

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

Answer

3.125 volt

Answer

31.25 volt

Answer

0.03125 volt

Question 4

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

Answer

Magnetic flux density

Answer

Mutual induction

Answer

Motional emf

Question 5

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

Answer

Maximum magnetic flux

Answer

Rate of change of magnetic flux

Answer

Change in magnetic flux

Answer

Initial magnetic flux

Question 6

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

Answer

Joule’s Law

Answer

Faraday’s law

Answer

Ohm’s Law

Answer

Coulomb’s Law

Question 7

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

Answer

Linear momentum

Answer

Angular momentum

Question 8

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

Answer

Is determined by the rate of current flux

Answer

Is found by the right hand rule

Answer

Is found by the left hand rule

Answer

Always opposes the cause producing it

Question 9

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

Answer

A.C generator

Answer

D.C dynamo

Answer

Induction coil

Answer

Transformer

Question 10

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

Answer

Electromagnetic induction

Answer

Mutual induction

Answer

Faraday’s law

Answer

Electromagnetic interference

Question 11

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

Answer

Low voltage

Answer

Heavy current

Answer

High voltage

Answer

None of these

Question 12

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

Answer

Back emf is equal to applied voltage

Answer

Back emf is equal and opposite to applied voltage

Answer

Back emf is less than applied voltage

Answer

None of these

Question 13

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

Answer

Television

Answer

Computer monitors

Answer

All of these

Question 14

14. In order to improve the efficiency of the transformer

Answer

Core pieces should be laminated

Answer

Hysteresis loop is of small area

Answer

Wire should be of pure copper

Answer

All of these

Question 15

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

Answer

Induced emf

Answer

Self-induced emf

Answer

Motional emf

Question 16

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

Answer

All of these

Question 17

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

Answer

Eddy current loss

Answer

Electrical resistance

Answer

Inductance

Question 18

18. Slip rings are used in the device

Answer

A.C. motor

Answer

D.C. motor

Answer

A.C. generator

Answer

All of these

Question 19

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

Answer

D.C. motor

Answer

Galvanometer

Question 20

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

Answer

Mechanical energy

Answer

Electrical energy

Answer

Frictional energy

Answer

None of these

Question 21

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

Answer

Series or parallel

Answer

None of these

Question 22

22. When the motor is just start back emf is

Answer

Almost zero

Answer

None of these

Question 23

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

Answer

Steel cored

Answer

Wooden cored

Answer

Soft iron cored

Question 24

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

Answer

Resistance

Answer

Voltage is generated

Answer

Current is generated

Answer

None of these

Question 25

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

Answer

Faraday’s law

Answer

Gauss’s law

Answer

Lenz’s law

Answer

None of these

Question 26

26. A transformer is a device which

Answer

Steps up A.C. voltage

Answer

Steps down

Answer

Steps up energy

Question 27

27. The power dissipation in the transformer is due to

Answer

Eddy currents

Answer

All of these

Question 28

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

Question 29

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

Question 30

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

Question 31

31. Quantity that remains unchanged in a transformer is

Answer

None of these

Question 32

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

Question 33

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

Answer

Its momentum changes but total energy remains the same

Answer

Both momentum and total energy remains the same

Answer

Both changes

Answer

Total energy change but momentum remains

Question 34

34. A transformer works on the principle of

Answer

Mutual induction

Answer

Self-induction

Question 35

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

Answer

Electric current

Answer

Magnetic field

Answer

Pressure radiant

Question 36

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):

Question 37

37. For high frequency, capacitor offers

Answer

More resistance

Answer

Less resistance

Answer

Zero resistance

Answer

None of these

Question 38

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

Question 39

39. The core of a transformer is laminated so that

Answer

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

Answer

The weight of the transformer may be reduced

Answer

Energy losses due to eddy currents may be minimized

Answer

Rusting of the core may be prevented

Question 40

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

Answer

Quadrupled

Answer

None of these

Question 41

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

Answer

Shows south polarity

Answer

Shows north polarity

Answer

Shows no polarity

Answer

Shows sometimes north and sometimes south polarity

Question 42

42. Alternating current is transmitted to distant places

Answer

At high voltage and low current

Answer

At high voltage and high current

Answer

At low voltage and low current

Answer

At low voltage and high current

Question 43

43. A capacitor is perfectly insulator for

Answer

Direct current

Answer

Alternating current

Answer

Direct as well as alternating current

Answer

None of these

Question 44

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

Question 45

45. The electromagnetic waves travel with a velocity

Answer

Equal to velocity of sound

Answer

Equal to velocity of light

Answer

Less than velocity of light

Answer

None of these

Question 46

46. The velocity of electromagnetic wave is parallel to

Question 47

47. Eddy current is produced when

Answer

A metal is kept in varying magnetic field

Answer

A metal is kept in the steady magnetic field

Answer

A circular coil is placed in a magnetic field

Answer

Through a circular coil, current is passed

Question 48

48. The energy stored in an inductor is

Answer

Electrostatic

Answer

Electromagnetic

Answer

Mechanical

Question 49

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

Answer

240 √2 V

Answer

230 √2 V

Answer

220 √2 V

Answer

200 √2 V

Question 50

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

Answer

The currents in the two coils

Answer

The rates at which currents are changing in the two coils

Answer

Relative position and orientation of the two coils

Answer

The materials of the wires of the coils

Question 51

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

Answer

Increase the secondary voltage

Answer

Reduce the energy loss due to eddy currents

Answer

Make it light weight

Answer

Make it or bust and strong

Question 52

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

Answer

It is easy to generate

Answer

Rectification is possible

Answer

Energy losses are minimum

Answer

It causes fewer accidents

Question 53

53. Eddy currents are used in

Answer

Induction furnace only

Answer

Electromagnetic brakes only

Answer

Speedometers only

Answer

All of these

Question 54

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

Answer

Sir. J. C. Bose

Question 55

55. Radio frequency choke uses core of

Answer

Air and iron

Answer

None of these

Question 56

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

Question 57

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Total Questions:	56
Time Allowed:	25 Minutes
Total Marks:	56
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Electromagnetic Induction Online Mcqs Test

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Maan Ali

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Important Physics Electromagnetic Induction Question and Answer

Physics Electromagnetic Induction Practice Test Online With Explanation

How to Score High in Physics Electromagnetic Induction Online Mcqs Test?

Key Preparation Tips:

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Maan Ali

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