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

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 # 4

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 # 5

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 # 6

Lenz's law is the consequence of

Mass A
Energy conservation B
Momentum conservation C
Charge D

Question # 7

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 # 8

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 # 9

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 # 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

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 # 13

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 # 14

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 # 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

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

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 # 18

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 # 19

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 # 20

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 # 21

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 # 22

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 # 23

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 # 24

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 # 25

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 # 26

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 # 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

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 # 29

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 # 30

Split rings act as

Vibrator A
Resistor B
Motor C
Commulator D

Sr.#	Question	Answer
1	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
2	Which of the following quantities remain constant in step up transformer?	A. Current B. Voltage C. Power D. Heat
3	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
4	When the conductor moved across a magnetic field:	A. Emf induced is similar to that of a battery B. Emf induced gives rise to induced current C. An emf induced across its ends D. All are correct
5	In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:	A. Both A and C B. Induced emf C. Both A and B D. Motion emf
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	Motional emf is called motional:	A. Electromagnetic force and is measured in newtons B. Electromotive force and is measured in volt C. Electromotive force and is measured in newtons D. Electromagnetic force and is measured in volts
8	The induced emf in a coil is proportional to:	A. Magnetic flux through a coil B. Rate of change of magnetic flux through the coil C. Area of the coil D. Product of magnetic flux and area of the coil
9	Split rings act as	A. Vibrator B. Resistor C. Motor D. Commulator
10	The rate change of area expressed is expressed in:	A. None of these B. ms^-1 C. m²s^-2 D. ms^-2

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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 induced current in a conductor depends upon:

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

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

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

The motional e.m.f depends upon the

Lenz's law is the consequence of

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

The magnitude of induced emf depends upon the:

The unit of induced emf is:

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

An induced current can be produced by

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

The phenomenon of generation of induced emf is called

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

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

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

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 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

The induced current is a conductor depends upon:

Eddy current is produced when:

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

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field 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 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 rate change of area expressed is expressed in:

In magnet-coil experiment, emf can be produced 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: