2nd Year Physics Chapter 15 Online MCQ Test for 12th Class Physics Chapter 15 (Electromagnetic Induction)

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MCQ's Test For Chapter 0 "Physics ICS Part 2 Chapter 15 Online MCQ's Test"

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Physics ICS Part 2 Chapter 15 Online MCQ's Test

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Question # 1

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

Question # 2

Energy density of an inductor is:

Question # 3

When motor is just started, back emf is almost.

Question # 4

What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10-2 Wb, and change in current is 0.01 A?

Question # 5

Self induction does not depend on

Question # 6

The movement of conductor in magnetic field produces electrical current was discovered in:

Question # 7

The only difference between the construction of D.C and A.C is.

Question # 8

The Direction of induced current is always so as to oppose the change which causes the current, is:

Question # 9

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

Question # 10

The motional emf developed in a conduction depends upon.

Question # 11

The jerks in D.C. motor are created by the use of.

Question # 12

Mutual induction has a practical role in the performance of the.

Question # 13

Transformer is used to change

Question # 14

The direction of induced current is always so as to oppose the change which causes the current is:

Question # 15

Energy density in an inductor is.

Question # 16

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

Question # 17

DC generator by william Sturgeon in:

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FSc Part II Physics Chapter 0 Important MCQ's

Sr.# Question Answer
1 Efficiency of transformer does not affected by
A. Input voltage
B. Core of transformer
C. Insulation between sheet
D. Resistance of coils
2 If speed of rotation of a generator is doubled the output voltage will be.
A. Remain same
B. Double
C. Four time
D. One half
3 If force in the direction of velocity of conductor,  then induced current is directed,
A. Anti clockwise
B. Clock wise
C. At equilibrium
D. None of above
4 When back emf in motor is zero, it draws.
A. Zero current
B. Minimum current
C. Maximum current
D. Steady current
5 Energy stored in an inductor is:
A. 1/2L2I
B. 1/2L2/I
C. 1/2LI2
D. 1/2LI
6 Eddy current is produced when:
A. A metal is light in varying magnetic field
B. A metal is kept in steady magnetic field
C. A circular coil is placed in a steady magnetic field
D. A current is passed through a circualr coil
7 Induced emf in A.C. generator can be increased by
A. Decreasing area of coil
B. Decreasing magnetic field
C. Increasing area of coil
D. Slowing down speed of coil
8 The magnitude of back emf:
A. Increases with sped of motor
B. Decreases with speed of motor
C. Remains same 
D. None of above
9 Lenz's law is a consequence of the law of conservation of
A. Charge
B. Momentum
C. Energy
D. Angular momentum
10 B2/2p is the expression of.
A. Lenz's law
B. Magnetic energy
C. Magnetic energy density
D. Back emf

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