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

Question # 1

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 # 2

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 # 3

Split rings act as

Vibrator A
Resistor B
Motor C
Commulator D

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

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 # 6

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 # 7

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 # 8

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 # 9

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 # 10

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 # 11

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 # 12

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 # 13

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 # 14

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 # 15

A.C. can be measure with the help of

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

Question # 16

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 # 17

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 # 18

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 # 19

The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called

Mutual induction A
Mutual inductance B
Capacitance C
Self inductance 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

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 # 22

Transformer is used to

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

Question # 23

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 # 24

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 # 25

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

Current A
Voltage B
Power C
Heat D

Question # 26

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 # 27

The law of electromagnetic induction is related to:

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

Question # 28

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 # 29

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 # 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	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
2	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
3	A device which converts Electrical energy into mechanical energy is called as	A. Transformer B. Generator C. Motor D. All of these
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	When a conductor moved with its length parallel to the lines of magnetic fled:	A. An emf is induced across its ends B. Emf induced is similar to that of a battery C. Emf passes through the conductor D. Both A and B
6	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
7	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
8	The phenomenon of generation of induced emf is called	A. Electrostatic induction B. Magnetic induction C. Electromagnetic induction D. Electric induction
9	The work is stored in the inductor as	A. Electric potential energy B. Elastic potential energy C. Magnetic energy D. Absolute potential energy
10	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:	A. Zero B. Of smaller magnitude C. Of larger magnitude D. Sometimes B, sometimes C

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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