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

Question # 1

The work is stored in the inductor as

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

Question # 2

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 # 3

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 # 4

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 # 5

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 # 6

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 # 7

A device which converts Electrical energy into mechanical energy is called as

Transformer A
Generator B
Motor C
All of these D

Question # 8

Back emf is produced due to

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

Question # 9

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 # 10

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 # 11

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 # 12

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 # 13

An emf is set up in a conductor when it:

is kept in a magnetic field A
is kept in a electric field B
Move across a magnetic field C
Both (A) and (B) D
None of these E

Question # 14

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 # 15

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 # 16

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 # 17

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

At the instant the switch is closed A
At the instant the switch is opened B
When switch is kept open C
When switch is kept closed D
None of these E

Question # 18

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 # 19

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 # 20

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 # 21

A.C. can be measure with the help of

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

Question # 22

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 # 23

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

At the instant the switch is closed A
At the instant the switch is opened B
When switch is kept open C
When switch is kept closed D
None of these E

Question # 24

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

Question # 25

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 # 26

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 # 27

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 # 28

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 # 29

Split rings act as

Vibrator A
Resistor B
Motor C
Commulator D

Question # 30

A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:

Zero A
Of smaller magnitude B
Of larger magnitude C
Sometimes B, sometimes C D
Neither of these E

Sr.#	Question	Answer
1	An induced current can be produced by:	A. Constant magnetic field B. Changing magnetic field C. Varying magnetic feild D. Constant electric field
2	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
3	The induced current in a conductor depends upon	A. Resistance of the loop B. Speed with which the conductor moves C. Any of these D. Both A and B
4	The current produced by moving a loop of wire across a magnetic field is called:	A. Direct current B. Magnetic current C. Alternating current D. Induced current
5	Referring to above figure, current in coil P falls from its maximum value to zero	A. At the instant the switch is closed B. At the instant the switch is opened C. When switch is kept open D. When switch is kept closed
6	The phenomenon of generation of induced emf is called:	A. Electrostatic induced B. Magnetic induced C. Electromagnetic induced D. Electric induced
7	The product of induced current and the resistance of the wire through which the current is passing is called:	A. Electromagnetic induction B. induced emf C. Induced current D. Self induced
8	An induced current can be produced by:	A. Constant magnetic field B. Changing magnetic field C. Varying magnetic field D. Constant electric field
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	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

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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

The work is stored in the inductor as

The induced current in the loop can be increased by:

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

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

When the conductor moved across a magnetic field:

The induced current is a conductor depends upon:

A device which converts Electrical energy into mechanical energy is called as

Back emf is produced due to

An emf is set up in a conductor when it:

The unit of induced emf is:

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

The magnitude of induced emf depends upon the:

An emf is set up in a conductor when it:

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

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

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

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

The magnitude of induced emf depends upon the

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

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

A.C. can be measure with the help of

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

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

The phenomenon of generation of induced emf is called

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 rate change of area expressed is expressed in:

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

The induced current in the loop can be Increased by

Split rings act as

A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:

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