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

Question # 1

Lenz's law is the consequence of

Mass A
Energy conservation B
Momentum conservation C
Charge D

Question # 2

The product of induced current and the resistance of the wire through which the current is passing is called:

Electromagnetic induction A
induced emf B
Induced current C
Self induced D
None of these E

Question # 3

The work is stored in the inductor as

Electric potential energy A
Elastic potential energy B
Magnetic energy C
Absolute potential energy D

Question # 4

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 # 5

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

Motion emf A
Electrostatic emf B
Induced emf C
Both A and B D
Both A and C E

Question # 6

The practical application of the phenomenon of Mutual induction is

Transformers A
Generator B
Motor C
All of these D

Question # 7

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 # 8

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

Is associated with coil P A
Is associated with coil S B
Causes an induced current is coil S C
All of these D
None of these E

Question # 9

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:

0.2 henry A
0.1 henry B
0.8 henry C
0.04 henry D

Question # 10

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 # 11

Referring to above figure, due to change in current in the coil P, the change in magnetic flux

Is associated with coil P A
Is associated with coil S B
Causes and induced current in coil S C
All of these D
None of these E

Question # 12

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 # 13

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 # 14

A.C. can be measure with the help of

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

Question # 15

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 # 16

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

Question # 17

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 # 18

An emf is set up in a conductor when it

Is kept in a magnetic field A
Is kept in an electric field B
Moves across a magnetic field C
Both A and B D
None of these E

Question # 19

Back emf is produced due to

Self induction A
Mutual induction B
A.C C
Lenz's law D

Question # 20

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 # 21

The law of electromagnetic induction is related to:

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

Question # 22

An induced current can be produced by

Constant magnetic field A
Changing magnetic field B
Varying electric field C
Constant electric field D
None of these E

Question # 23

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 # 24

What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10^-2Wb, and change in current is 0.01 A?

2 H A
3 H B
1/2 H C
Zero D

Question # 25

Faraday's law of electromagnetic induction has been used in the construction of:

Galvanometer A
Voltmeter B
Electric motor C
Electric genrator D
Commutator E

Question # 26

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 # 27

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 # 28

Which of the following is most suitable as the core of transformer

Soft iron A
Alinco B
Steel C
None of these D

Question # 29

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 # 30

The phenomenon of generation of induced emf is called

Electrostatic induction A
Magnetic induction B
Electromagnetic induction C
Electric induction D
Both (A) and (D) E

Sr.#	Question	Answer
1	Lenz's law is the consequence of	A. Mass B. Energy conservation C. Momentum conservation D. Charge
2	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:	A. 0.25 N B. 0.25 V C. 2.5 V D. 2.5 N
3	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
4	The Phenomenon of generation of induced emf is called	A. Electrostatic induction B. Magnetic induction C. Electromagnetic induction D. Electric induction
5	Split rings act as	A. Vibrator B. Resistor C. Motor D. Commulator
6	An emf is set up in a conductor when it	A. Is kept in a magnetic field B. Is kept in an electric field C. Moves across a magnetic field D. Both A and B
7	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)
8	Referring to above figure, due to change in current in the coil P, the change in magnetic flux:	A. Is associated with coil P B. Is associated with coil S C. Causes an induced current is coil S D. All of these
9	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
10	Lens's law deals with the	A. Magnitude of induced current B. Magnitude of induced e.m.f C. Direction of induced e.m.f D. Direction of induced current

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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

Lenz's law is the consequence of

The product of induced current and the resistance of the wire through which the current is passing is called:

The work is stored in the inductor as

The induced current in the loop can be increased by:

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

The practical application of the phenomenon of Mutual induction is

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

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

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:

The magnitude of induced emf depends upon the:

Referring to above figure, due to change in current in the coil P, the change in magnetic flux

Eddy current is produced when:

The induced current is a conductor depends upon:

A.C. can be measure with the help of

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

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

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

An emf is set up in a conductor when it

Back emf is produced due to

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

The law of electromagnetic induction is related to:

An induced current can be produced by

The magnitude of induced emf depends upon the:

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

Faraday's law of electromagnetic induction has been used in the construction of:

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

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

Which of the following is most suitable as the core of transformer

The rate change of area expressed is expressed in:

The phenomenon of generation of induced emf is called

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What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10^-2Wb, and change in current is 0.01 A?