ECAT Pre General Science Chapter 15 online mcq test with answers for Physics chapter 15 (Electromagnetic Induction)

Question # 1

When a conductor is moved across a magnetic field, the redistribution of charge sets up:

Magnetic field A
Electrostatic field B
Electromagnetic field C
All of these D
None of these E

Question # 2

A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:

The coil is destroyed A
The coil is Rotated B
The coil is neither destroyed nor rotated C
Both (A) and (B) D
None of these E

Question # 3

In magnet-coil experiment, emf can be produced by:

Keeping the coil stationary and moving the magnet A
Keeping the magnet stationary and moving the coil B
Relative motion of the loop and magnet C
Any one of above D
All above E

Question # 4

The magnitude of induced emf depends upon the:

Rate of decrease of magnetic field A
Rate of change of magnetic field B
Rate of increase of magnetic flux C
Constancy of magnetic field D
None of these E

Question # 5

Eddy current is produced when:

A metal is kept in varying magnetic field A
A metal is kept in steady magnetic field B
A circular coil is placed in a steady magnetic field C
A current is passed through a circular coil D

Question # 6

Referring to above figure, current in the coil P grows from zero to its maximum value:

At the instant the switch is closed A
At the instant the switch is opened B
When switch is kept open C
All of above D
Neither of above E

Question # 7

For inducting emf in a coil the basic requirement is that:

Flux should link the coil A
Change in flux should link the coil B
Coil should form a closed loop C
Both B and C are true D

Question # 8

Which of the following quantities remain constant in step up transformer?

Current A
Voltage B
Power C
Heat D

Question # 9

A.C. can be measure with the help of

Nuclear effect A
Magnetic effect B
Chemical effect C
Heating effect D

Question # 10

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when

The coil is distorted A
The coil is rotated B
The coil is neither distorted nor rotated C
Both A and B D
None of these E

Question # 11

Michael Faraday and Joseph Henry belong respectively to

USA and England A
England and France B
England and USA C
USA and France D
None of these E

Question # 12

When there is no relative motion between the magnet and coil, the galvanometer indicated

No current in the circuit A
An increasing current B
A decreasing current C
A constant current D
Either B or C E

Question # 13

The magnitude of induced emf depends upon the

Rate of decrease of magnetic field A
Rate of change of magnetic field B
Rate of increase of magnetic flux C
Constancy of magnetic field D
None of these E

Question # 14

A metal road of length 1m is moving at a speed of 1 ms^-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:

0.25 N A
0.25 V B
2.5 V C
2.5 N D
25 V E

Question # 15

The rate change of area expressed is expressed in:

None of these A
ms^-1 B
m²s^-2 C
ms^-2 D
m²s^-1 E

Question # 16

In magnet-coil experiment, emf can be produced by

Keeping the coil stationary and moving the magnet A
Keeping the magnet stationary and moving B
Relative motion of the loop and magnet C
Any one of above D
All above E

Question # 17

The induced current is a conductor depends upon:

Resistance of the loop A
Speed with which the conductor moves B
Any of these C
Both (A) and (B) D
None of these E

Question # 18

The current produced by moving a loop of wire across a magnetic field is called

Direct current A
Magnetic current B
Alternating current C
Induced current D
None of these E

Question # 19

The induced current in the loop can be increased by:

Using a strong magnetic field A
Moving the loop faster B
Replacing the loop by a coil of many turns C
All of above D
None of these E

Question # 20

When a conductor moved with its length parallel to the lines of magnetic fled:

An emf is induced across its ends A
Emf induced is similar to that of a battery B
Emf passes through the conductor C
Both A and B D
None of these E

Question # 21

Motional emf is called motional:

Electromagnetic force and is measured in newtons A
Electromotive force and is measured in volt B
Electromotive force and is measured in newtons C
Electromagnetic force and is measured in volts D
None of these E

Question # 22

The change of magnetic flux through a circuit will produce

Magnetic Field A
Electric Field B
emf C
a.c D

Question # 23

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

45 V A
15 V B
90 V C
300 V D

Question # 24

The current produced by moving a loop of wire across a magnetic field is called:

Direct current A
Magnetic current B
Alternating current C
Induced current D
None of these E

Question # 25

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current

Of same magnitude in the same direction A
Of different magnitude in the same direction B
Of same magnitude but in opposite direction C
Of different magnitude in the opposite direction D
None of these E

Question # 26

The practical application of the phenomenon of Mutual induction is

Transformers A
Generator B
Motor C
All of these D

Question # 27

Referring to above figure, a changing current in coil P can be produced:

At the instant the switch is closed A
At the instant the switch is opened B
With the help of rheostat C
All of these D
None of these E

Question # 28

The motional e.m.f depends upon the

Length of a conductor A
Strength of a magnet B
Speed of the conductor C
All of the above D

Question # 29

When a conductoris moved across a magnetic field:

Emf induced its similar to that of a battery A
Emf induced gives rise to induced current B
An emf is induced across its ends C
All are correct D
None of these E

Question # 30

The direction of induced current is always so as to oppose the cause which produces it. This is

Lenz's law A
Ampere's law B
Faraday's law C
Coulomb's law D
None of these E

Sr.#	Question	Answer
1	In a coil current change from 2 to 4 A in .05 s. If the average induced emf is 8V then coefficient of self-inductance is:	A. 0.2 henry B. 0.1 henry C. 0.8 henry D. 0.04 henry
2	The Phenomenon of generation of induced emf is called	A. Electrostatic induction B. Magnetic induction C. Electromagnetic induction D. Electric induction
3	In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:	A. Motion emf B. Electrostatic emf C. Induced emf D. Both A and B
4	Referring to above figure, current in the coil P grows from zero to its maximum value	A. At the instant the switch is closed B. At the instant the switch is opened C. When switch is kept open D. All of above
5	A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when	A. The coil is distorted B. The coil is rotated C. The coil is neither distorted nor rotated D. Both A and B
6	Back emf is produced due to	A. Self induction B. Mutual induction C. A.C D. Lenz's law
7	The SI unit of magnetic induction is	A. Weber B. Weber/meter C. Henry D. Tesla
8	A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:	A. The coil is destroyed B. The coil is Rotated C. The coil is neither destroyed nor rotated D. Both (A) and (B)
9	Lenz's law is the consequence of	A. Mass B. Energy conservation C. Momentum conservation D. Charge
10	Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:	A. 45 V B. 15 V C. 90 V D. 300 V

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ECAT Pre General Science Physics Chapter 15 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction

ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction