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

Question # 1

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 # 2

An induced current can be produced by:

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

Question # 3

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

Transformer A
AC generator B
Alternator C
Dynamo D

Question # 4

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 # 5

Transformer is used to

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

Question # 6

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 # 7

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 # 8

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 # 9

The SI unit of magnetic induction is

Weber A
Weber/meter B
Henry C
Tesla D

Question # 10

Back emf is produced due to

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

Question # 11

An induced current can be produced by:

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

Question # 12

Self inducede e.m.f. is also called

Motional e.m.f. A
Thermistor B
Electrostatic induction C
Back e.m.f D

Question # 13

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 # 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 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 # 16

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 # 17

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 # 18

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 # 19

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 # 20

Lenz's law is the consequence of

Mass A
Energy conservation B
Momentum conservation C
Charge D

Question # 21

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 # 22

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 # 23

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 # 24

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 # 25

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

Soft iron A
Alinco B
Steel C
None of these D

Question # 26

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 # 27

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

Question # 28

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 # 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

Split rings act as

Vibrator A
Resistor B
Motor C
Commulator D

Sr.#	Question	Answer
1	For inducting emf in a coil the basic requirement is that:	A. Flux should link the coil B. Change in flux should link the coil C. Coil should form a closed loop D. Both B and C are true
2	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)
3	Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:	A. Of same magnitude in the same direction B. Of different magnitude in the same direction C. Of same magnitude but in opposite direction D. Of different magnitude in the opposite direction
4	In magnet-coil experiment, emf can be produced by:	A. Keeping the coil stationary and moving the magnet B. Keeping the magnet stationary and moving the coil C. Relative motion of the loop and magnet D. Any one of above
5	The induced current in the loop can be increased by:	A. Using a strong magnetic field B. Moving the loop faster C. Replacing the loop by a coil of many turns D. All of above
6	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
7	The motional e.m.f depends upon the	A. Length of a conductor B. Strength of a magnet C. Speed of the conductor D. All of the above
8	The direction of induced current is always so as to oppose the cause which produces it. This is	A. Lenz's law B. Ampere's law C. Faraday's law D. Coulomb's law
9	The phenomenon of generation of induced emf is called:	A. Electrostatic induced B. Magnetic induced C. Electromagnetic induced D. Electric induced
10	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

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

An induced current can be produced by:

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

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

Transformer is used to

An emf is set up in a conductor when it:

An emf is set up in a conductor when it:

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

The SI unit of magnetic induction is

Back emf is produced due to

An induced current can be produced by:

Self inducede e.m.f. is also called

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

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:

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

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

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

In magnet-coil experiment, emf can be produced by

The magnitude of induced emf depends upon the:

Lenz's law is the consequence of

The induced current in the loop can be increased by:

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:

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

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

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?

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:

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

The induced current in the loop can be increased by:

Split rings act as

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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:

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?