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ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers
Question # 1
The Phenomenon of generation of induced emf is called
Choose an answer
Electrostatic induction
Magnetic induction
Electromagnetic induction
Electric induction
Both A and B
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Question # 2
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 # 3
The induced current in a conductor depends upon
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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 # 4
Micheal Faraday and joseph Henry belong respectively to:
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USA and England
England and France
England and USA
USA and France
None of these
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Question # 5
Transformer is used to
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Increase alternating current
Increase d.c voltage
Increase & Decrease emf
All answers are right
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Question # 6
Back emf is produced due to
Choose an answer
Self induction
Mutual induction
A.C
Lenz's law
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Question # 7
A metal road of length 1m is moving at a speed of 1 ms
-1
In a direction making angle of 30
ยบ with 0.5 Y magnetic field. The emf produced in the rod is:
Choose an answer
0.25 N
0.25 V
2.5 V
2.5 N
25 V
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Question # 8
Split rings act as
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Vibrator
Resistor
Motor
Commulator
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Question # 9
When a conductoris moved across a magnetic field:
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Emf induced its similar to that of a battery
Emf induced gives rise to induced current
An emf is induced across its ends
All are correct
None of these
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Question # 10
The unit of induced emf is:
Choose an answer
Volt
Nm/As
Joule coul
-1
Both A and C
All of these
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Question # 11
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 # 12
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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Question # 13
The work is stored in the inductor as
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Electric potential energy
Elastic potential energy
Magnetic energy
Absolute potential energy
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Question # 14
When there is no relative motion between the magnet and coil, the galvanometer indicates:
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No current in circuit
An increasing current
A decreasing current
Either B or C
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Question # 15
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 # 16
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 # 17
An induced current can be produced by
Choose an answer
Constant magnetic field
Changing magnetic field
Varying electric field
Constant electric field
None of these
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Question # 18
What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10
-2
Wb, and change in current is 0.01 A?
Choose an answer
2 H
3 H
1/2 H
Zero
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Question # 19
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 # 20
Lenz's law is the consequence of
Choose an answer
Mass
Energy conservation
Momentum conservation
Charge
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Question # 21
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 # 22
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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Question # 23
The phenomenon of generation of induced emf is called
Choose an answer
Electrostatic induction
Magnetic induction
Electromagnetic induction
Electric induction
Both (A) and (D)
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Question # 24
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 # 25
The change of magnetic flux through a circuit will produce
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Magnetic Field
Electric Field
emf
a.c
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Question # 26
Which of the following is most suitable as the core of transformer
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Soft iron
Alinco
Steel
None of these
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Question # 27
Lens's law deals with the
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Magnitude of induced current
Magnitude of induced e.m.f
Direction of induced e.m.f
Direction of induced current
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Question # 28
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 # 29
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 # 30
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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