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Online Tests
ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers
Question # 1
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 # 2
The induced emf in a coil is proportional to:
Choose an answer
Magnetic flux through a coil
Rate of change of magnetic flux through the coil
Area of the coil
Product of magnetic flux and area of the coil
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Question # 3
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 # 4
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 # 5
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 # 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
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 # 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 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 # 10
The SI unit of magnetic induction is
Choose an answer
Weber
Weber/meter
Henry
Tesla
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Question # 11
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 # 12
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 # 13
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 # 14
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 # 15
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 # 16
The law of electromagnetic induction is related to:
Choose an answer
Coulomb
Ampere
Faraday
Lenz
None of these
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Question # 17
Which of the following quantities remain constant in step up transformer?
Choose an answer
Current
Voltage
Power
Heat
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Question # 18
The product of induced current and the resistance of the wire through which the current is passing is called:
Choose an answer
Electromagnetic induction
induced emf
Induced current
Self induced
None of these
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Question # 19
Motional emf is called motional:
Choose an answer
Electromagnetic force and is measured in newtons
Electromotive force and is measured in volt
Electromotive force and is measured in newtons
Electromagnetic force and is measured in volts
None of these
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Question # 20
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 an induced current is coil S
All of these
None of these
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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
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 # 23
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 # 24
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 # 25
When a conductoris moved across a magnetic field:
Choose an answer
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 # 26
The device in which induced emf is statically induced emf is:
Choose an answer
Transformer
AC generator
Alternator
Dynamo
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Question # 27
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 # 28
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 # 29
Lens's law deals with the
Choose an answer
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 # 30
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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