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ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers
Question # 1
An emf is set up in a conductor when it:
Choose an answer
is kept in a magnetic field
is kept in a electric field
Move across a magnetic field
Both (A) and (B)
None of these
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Question # 2
The rate change of area expressed is expressed in:
Choose an answer
m
2
s
-1
ms
-2
m
2
s
-2
ms
-1
None of these
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Question # 3
The induced current in the loop can be increased by:
Choose an answer
Using a strong magnetic field
Moving the loop faster
Replacing the loop by a coil of many turns
All of above
None of these
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Question # 4
The current produced by moving a loop of wire across a magnetic field is called:
Choose an answer
Direct current
Magnetic current
Alternating current
Induced current
None of these
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Question # 5
The current produced by moving a loop of a wire across a magnetic field is called:
Choose an answer
Direct current
Magnetic current
Alternating current
Induced current
None of these
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Question # 6
The SI unit of magnetic induction is
Choose an answer
Weber
Weber/meter
Henry
Tesla
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Question # 7
Referring to above figure, due to change in current in the coil P, the change in magnetic flux
Choose an answer
Is associated with coil P
Is associated with coil S
Causes and induced current in coil S
All of these
None of these
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Question # 8
In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:
Choose an answer
Motion emf
Electrostatic emf
Induced emf
Both A and B
Both A and C
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Question # 9
The magnitude of induced emf depends upon the:
Choose an answer
Rate of decrease of magnetic field
Rate of change of magnetic field
Rate of increase of magnetic flux
Constancy of magnetic field
None of these
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Question # 10
The motional e.m.f depends upon the
Choose an answer
Length of a conductor
Strength of a magnet
Speed of the conductor
All of the above
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Question # 11
The device in which induced emf is statically induced emf is:
Choose an answer
Transformer
AC generator
Alternator
Dynamo
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Question # 12
A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when
Choose an answer
The coil is distorted
The coil is rotated
The coil is neither distorted nor rotated
Both A and B
None of these
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Question # 13
The current produced by moving a loop of wire across a magnetic field is called
Choose an answer
Direct current
Magnetic current
Alternating current
Induced current
None of these
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Question # 14
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:
Choose an answer
0.2 henry
0.1 henry
0.8 henry
0.04 henry
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Question # 15
An induced current can be produced by:
Choose an answer
Constant magnetic field
Changing magnetic field
Varying magnetic field
Constant electric field
None of these
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Question # 16
In magnet-coil experiment, emf can be produced by
Choose an answer
Keeping the coil stationary and moving the magnet
Keeping the magnet stationary and moving
Relative motion of the loop and magnet
Any one of above
All above
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Question # 17
The practical application of the phenomenon of Mutual induction is
Choose an answer
Transformers
Generator
Motor
All of these
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Question # 18
A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:
Choose an answer
The coil is destroyed
The coil is Rotated
The coil is neither destroyed nor rotated
Both (A) and (B)
None of these
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Question # 19
The direction of induced current is always so as to oppose the cause which produces it. This is
Choose an answer
Lenz's law
Ampere's law
Faraday's law
Coulomb's law
None of these
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Question # 20
Referring to above figure, current in coil P falls from its maximum value to zero:
Choose an answer
At the instant the switch is closed
At the instant the switch is opened
When switch is kept open
When switch is kept closed
None of these
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Question # 21
The change of magnetic flux through a circuit will produce
Choose an answer
Magnetic Field
Electric Field
emf
a.c
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