Physics MCQs 2nd Year Chapter No.4 ELECTROMAGNETIC INDUCTION Test No. 2, FSc, Grade 12, Second Year Multiple Choice Questions, Medical College ( MDCAT ) , ECAT & University Admission Entry Test Exams Online Preparation, Chapter Wise Questions Answers Quiz Notes in Pdf Download, All Old Board Papers included, All Queries reply within 24 Hours. Click here to Contact us for any Query/Question regarding Exams.

PHYSICS – 2nd Year
Chapter No. 4  [Test No.2]
Multiple Choice Questions
Note : All MCQ’s selected in this test are from OLD F.Sc. board , UHS and PMC(Pakistan Medical Commission) Islamabad Papers.


Book Name :  PHYSICS
Chapter No. 4 ( Test No. 2 )
Total MCQ from Text Book :  89
Book Version  :

Published By : Punjab Text Book Board Lahore
Approved By : Govt of the Punjab and Federal Ministry for Education
Test Type : MCQ’s
Exam conduct By : Inter Boards of Sindh, KPK, Balochistan, AJK, Gilgit Baltistan, Punjab & Federal
Class / Grade  : 12th ( F.Sc. Intermediate)
Total Marks : 89
Total Time :   89 minutes




1 / 89

SI unit of self inductance is Henry which is

2 / 89

Energy density of an inductor is

3 / 89

Lenz's law is in accordance with the Law of Conservation of

4 / 89

The motional emf is given by

5 / 89

The angular speed of rotation of the coil of A.C generator is doubled. Then induced emf will be

6 / 89

Which one of the following is not present in an A.C generator

7 / 89

In case of inductor, energy is stored in the

8 / 89

Commutator was invented by

9 / 89

Mutual Induction has a practical role in the performance of the

10 / 89

B2/µo is the expression of

11 / 89

SI unit of mutual inductance is

12 / 89

Henry is SI unit of

13 / 89

The energy stored in an inductor is given as

14 / 89

The mutual Inductance between two coils depends upon their

15 / 89

The core of transformer is-made of

16 / 89

A solenoid of length / meter has self-inductance L henry. If the number of turns are doubled, its self-inductance

17 / 89

SI unit of self inductance is Henry which is

18 / 89

Which one is not present in A.C generator?

19 / 89

Which of the following quantity decreases in a step-up transformer?

20 / 89

When the back emf in a circuit is zero, it draws

21 / 89

If the motor is overloaded, the magnitude of back emf

22 / 89

With the speed of motor, magnitude of black emf

23 / 89

The self-inductance of a coil is 5H. The current changes from 1A to 2A in 5 second through the coil. Which of the following is the value of induced emf produced in the coil?

24 / 89

Turns ratio (r) for a step down transformer is

25 / 89

In electromagnetic induction the induced emf is independent of

26 / 89

A transformer is used to step up or step down

27 / 89

Efficiency of transformer is not affected by

28 / 89

If the motor is overloaded then magnitude of back emf

29 / 89

Electricity can be transmitted overlong distances by

30 / 89

In a step up transformer the turn ratio of primary and secondary coil is 1:2. A cell of 1.5V is connected across the primary coil which of the following will be voltage of secondary coil?

31 / 89

In transformer which one of the following does not change

32 / 89

If the speed of rotation of a generator is doubled the output voltage will be

33 / 89

The rod of unit length is moving at 30° through a magnetic field of 1 T. If velocity of rod is 1 m/s, then induced emf in the rod will be given by

34 / 89

When a motor is over loaded, then the magnetic of back emf

35 / 89

The induced currents setup in the core of transformer in a direction perpendicular to the flux are known as

36 / 89

Lenz's law is in accordance with the Law of Conservation of

37 / 89

If the magnetic flux linked with a coil varies at the rate of 1Wb/min. Then induced emf will be

38 / 89

The number of turns in a coil is increased from 10 to 100. Its self-inductance becomes

39 / 89

Lenz's law is in accordance with the Law of Conservation of

40 / 89

Energy stores in an inductor is given by

41 / 89

Transformer is used to change

42 / 89

The reactance of an Inductor at 50 Hz is 100 its reactance at 100 Hz becomes

43 / 89

In step up transformer

44 / 89

Transformer makes possible the

45 / 89

A coil having number of turns N and cross sectional area A is rotated in a uniform magnetic field B with an angular velocity w. Which of the following is the maximum induced emf in it?

46 / 89

A real transformer does not change

47 / 89

Energy density in inductor is given by

48 / 89

The working principle of transformer is

49 / 89

Which of the following are the power losses in a transformer?

50 / 89

An increase in number of turns of a coil result in

51 / 89

When the motor is just started, back emf is

52 / 89

The mutual inductance of a pair of coils each of N turns, is M henry. If a current of I ampere in one of the coil is brought to zero in t seconds, The average induced emf in other coil, in volt, will be

53 / 89

Lenz's law is in accordance with law of conservation of

54 / 89

By placing soft iron inside a coil

55 / 89

The loss of energy over an A.C. cycle during the magnetization and demagnetization of transformer core is usually called

56 / 89

For on ideal Transformer

57 / 89

Unit of self Inductance is

58 / 89

If L and R denotes inductance and resistance then dimensional formula for L/R is

59 / 89

The mutual induction plays role in

60 / 89

The SI unit of magnetic induction is

61 / 89

In transformer works on the principle of

62 / 89

The winding of the electromagnet in motor are usually called

63 / 89

Eddy currents is one cause of energy loss, in

64 / 89

The self inductance of solenoid is

65 / 89

In step down transformer

66 / 89

A transformer

67 / 89

Commutator's are used in

68 / 89

The devices in the circuit that consume electrical energy are known as

69 / 89

A step up transformer is used 120 v line to provide 240 v. If primary coil has 100 turns. The number of turns in secondary is

70 / 89

Commentator was invented in

71 / 89

The current passing through a choke coil of 5H is decreasing at the rate of 2A/s Which of the following is the emf developed across the coil?

72 / 89

A changing electric flux creates

73 / 89

Transformer for domestic use step down the voltage to

74 / 89

Self induced emf is sometimes called as

75 / 89

A device which converts low voltage or current to high voltage or current is called

76 / 89

Self inductance does not depend upon

77 / 89

Induction furnace based upon the concern of

78 / 89

Lenz's law deals with

79 / 89

The self-induction is given by

80 / 89

A conducting rod of length l falling with velocity V perpendicular to magnetic field B. Which of the following is potential difference between two ends

81 / 89

The Lenz's Law fulfills

82 / 89

The equation for energy density is given as

83 / 89

The turn ratio of a step-up transformer is 4:1. If the current of 4A is passing through the primary coil. Then current in secondary coil will be

84 / 89

The turns ratio of a transformer is 10 it means that

85 / 89

The turn ratio of a transformer is 10. It means that

86 / 89

The main causes of power losses in a transformer are

87 / 89

Which of the following quantity remain unchanged in a transformer?

88 / 89

The core of dynamo is laminated because

89 / 89

When motor is just started, back emf is almost

Your score is

The average score is 48%


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