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ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers
Question # 1
When a conductor moved with its length parallel to the lines of magnetic fled:
Choose an answer
An emf is induced across its ends
Emf induced is similar to that of a battery
Emf passes through the conductor
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
When the conductor moved across a magnetic field:
Choose an answer
Emf induced is similar to that of a battery
Emf induced gives rise to induced current
An emf induced across its ends
All are correct
None of these
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Question # 4
Faraday's law of electromagnetic induction has been used in the construction of:
Choose an answer
Galvanometer
Voltmeter
Electric motor
Electric genrator
Commutator
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Question # 5
When there is no relative motion between the magnet and coil, the galvanometer indicates:
Choose an answer
No current in circuit
An increasing current
A decreasing current
Either B or C
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Question # 6
The practical application of the phenomenon of Mutual induction is
Choose an answer
Transformers
Generator
Motor
All of these
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Question # 7
Lenz's law is the consequence of
Choose an answer
Mass
Energy conservation
Momentum conservation
Charge
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Question # 8
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 # 9
The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called
Choose an answer
Mutual induction
Mutual inductance
Capacitance
Self inductance
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Question # 10
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 # 11
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 # 12
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 # 13
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 # 14
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 # 15
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 # 16
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 # 17
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 # 18
Which of the following quantities remain constant in step up transformer?
Choose an answer
Current
Voltage
Power
Heat
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Question # 19
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 # 20
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 # 21
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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