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

The induced emf in a coil is proportional to:

Magnetic flux through a coil A
Rate of change of magnetic flux through the coil B
Area of the coil C
Product of magnetic flux and area of the coil D

Question # 3

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 # 4

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 # 5

The induced current in the loop can be Increased by

Using a stronger magnetic field A
Moving the loop faster B
Replacing the loop by a coil of many turns C
All above D
Both A and B E

Question # 6

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 # 7

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 # 8

When the conductor moved across a magnetic field:

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

Question # 9

Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:

Also 20º
A
70º
B
90º
C
180º
D
None of these E

Question # 10

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

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

Question # 11

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 # 12

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 # 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

The law of electromagnetic induction is related to:

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

Question # 15

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 # 16

The unit of induced emf is:

Volt A
Nm/As B
Joule coul^-1 C
Both A and C D
All of these E

Question # 17

Transformer is used to

Increase alternating current A
Increase d.c voltage B
Increase & Decrease emf C
All answers are right D

Question # 18

The induced current in 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 # 19

The work is stored in the inductor as

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

Question # 20

The induced current in the loop can be increased by:

Using a stronger magnetic field A
Moving the loop faster B
Replacing the loop by a coil of many turns C
All above D
Both (A) and (B) E

Question # 21

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 # 22

The phenomenon of generation of induced emf is called:

Electrostatic induced A
Magnetic induced B
Electromagnetic induced C
Electric induced D
Both A and C E

Question # 23

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

Soft iron A
Alinco B
Steel C
None of these D

Question # 24

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 # 25

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

Current A
Voltage B
Power C
Heat D

Question # 26

The device in which induced emf is statically induced emf is:

Transformer A
AC generator B
Alternator C
Dynamo D

Question # 27

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

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

Question # 28

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 # 29

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 # 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	Which of the following is most suitable as the core of transformer	A. Soft iron B. Alinco C. Steel D. None of these
2	Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:	A. Also 20º B. 70º C. 90º D. 180º
3	The phenomenon of generation of induced emf is called:	A. Electrostatic induced B. Magnetic induced C. Electromagnetic induced D. Electric induced
4	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
5	The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called	A. Mutual induction B. Mutual inductance C. Capacitance D. Self inductance
6	Eddy current is produced when:	A. A metal is kept 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 circular coil
7	The magnitude of induced emf depends upon the	A. Rate of decrease of magnetic field B. Rate of change of magnetic field C. Rate of increase of magnetic flux D. Constancy of magnetic field
8	The SI unit of magnetic induction is	A. Weber B. Weber/meter C. Henry D. Tesla
9	Referring to above figure, a changing current in coil P can be produced:	A. At the instant the switch is closed B. At the instant the switch is opened C. With the help of rheostat D. All of these
10	A device which converts Electrical energy into mechanical energy is called as	A. Transformer B. Generator C. Motor D. All of these

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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

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

The induced emf in a coil is proportional to:

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

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

The induced current in the loop can be Increased by

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

An emf is set up in a conductor when it

When the conductor moved across a magnetic field:

Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:

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

An induced current can be produced by

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

The induced current is a conductor depends upon:

The law of electromagnetic induction is related to:

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

The unit of induced emf is:

Transformer is used to

The induced current in a conductor depends upon:

The work is stored in the inductor as

The induced current in the loop can be increased by:

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

The phenomenon of generation of induced emf is called:

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

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

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

The device in which induced emf is statically induced emf is:

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

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

The induced current in the loop can be increased by:

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

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