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ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers
Question # 1
The law of electromagnetic induction is related to:
Choose an answer
Coulomb
Ampere
Faraday
Lenz
None of these
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Question # 2
Self inducede e.m.f. is also called
Choose an answer
Motional e.m.f.
Thermistor
Electrostatic induction
Back e.m.f
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Question # 3
An emf is set up in a conductor when it
Choose an answer
Is kept in a magnetic field
Is kept in an electric field
Moves across a magnetic field
Both A and B
None of these
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Question # 4
The change of magnetic flux through a circuit will produce
Choose an answer
Magnetic Field
Electric Field
emf
a.c
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Question # 5
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 # 6
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 # 7
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 # 8
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 # 9
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 # 10
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 # 11
Referring to above figure, a changing current in coil P can be produced:
Choose an answer
At the instant the switch is closed
At the instant the switch is opened
With the help of rheostat
All of these
None of these
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Question # 12
Eddy current is produced when:
Choose an answer
A metal is kept in varying magnetic field
A metal is kept in steady magnetic field
A circular coil is placed in a steady magnetic field
A current is passed through a circular coil
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Question # 13
The induced current in a conductor depends upon
Choose an answer
Resistance of the loop
Speed with which the conductor moves
Any of these
Both A and B
None of these
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Question # 14
The practical application of the phenomenon of Mutual induction is
Choose an answer
Transformers
Generator
Motor
All of these
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Question # 15
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 # 16
The phenomenon of generation of induced emf is called:
Choose an answer
Electrostatic induced
Magnetic induced
Electromagnetic induced
Electric induced
Both A and C
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Question # 17
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 # 18
For inducting emf in a coil the basic requirement is that:
Choose an answer
Flux should link the coil
Change in flux should link the coil
Coil should form a closed loop
Both B and C are true
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Question # 19
Plan of a coil makes an angle of 20
º with the lines of magnetic field. The angle between B and vector area of plane of coil is:
Choose an answer
Also 20
º
70
º
90
º
180
º
None of these
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Question # 20
Lenz's law is the consequence of
Choose an answer
Mass
Energy conservation
Momentum conservation
Charge
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Question # 21
Back emf is produced due to
Choose an answer
Self induction
Mutual induction
A.C
Lenz's law
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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
Choose an answer
Of same magnitude in the same direction
Of different magnitude in the same direction
Of same magnitude but in opposite direction
Of different magnitude in the opposite direction
None of these
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Question # 23
Referring to above figure, current in the coil P grows from zero to its maximum value:
Choose an answer
At the instant the switch is closed
At the instant the switch is opened
When switch is kept open
All of above
Neither of above
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Question # 24
The induced current is a conductor depends upon:
Choose an answer
Resistance of the loop
Speed with which the conductor moves
Any of these
Both (A) and (B)
None of these
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Question # 25
Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:
Choose an answer
45 V
15 V
90 V
300 V
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Question # 26
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 # 27
Micheal Faraday and joseph Henry belong respectively to:
Choose an answer
USA and England
England and France
England and USA
USA and France
None of these
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Question # 28
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 the coil
Relative motion of the loop and magnet
Any one of above
All above
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Question # 29
An emf is set up in a conductor when it:
Choose an answer
Is kept in a magnetic field
Is kept in an electric field
Moves across a magnetic field
Both A and B
None of these
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Question # 30
The SI unit of magnetic induction is
Choose an answer
Weber
Weber/meter
Henry
Tesla
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Question # 31
The induced current in the loop can be increased by:
Choose an answer
Using a stronger magnetic field
Moving the loop faster
Replacing the loop by a coil of many turns
All above
Both (A) and (B)
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