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ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers
Question # 1
A metal road of length 1m is moving at a speed of 1 ms
-1
In a direction making angle of 30
º 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 # 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
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 # 4
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 # 5
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 # 6
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 # 7
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 # 8
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 # 9
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 # 10
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 # 11
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 # 12
The law of electromagnetic induction is related to:
Choose an answer
Coulomb
Ampere
Faraday
Lenz
None of these
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Question # 13
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 # 14
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 # 15
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 # 16
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 # 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
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 # 19
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 # 20
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 # 21
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 # 22
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 # 23
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 # 24
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 # 25
A.C. can be measure with the help of
Choose an answer
Nuclear effect
Magnetic effect
Chemical effect
Heating effect
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Question # 26
A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:
Choose an answer
Zero
Of smaller magnitude
Of larger magnitude
Sometimes B, sometimes C
Neither of these
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Question # 27
Transformer is used to
Choose an answer
Increase alternating current
Increase d.c voltage
Increase & Decrease emf
All answers are right
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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
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 # 30
An induced current can be produced by:
Choose an answer
Constant magnetic field
Changing magnetic field
Varying magnetic feild
Constant electric field
None of these
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Question # 31
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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