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Online Tests
Physics Fsc Part 2 Chapter 4 Online Test MCQs With Answers
Question # 1
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Lenz's law
Faraday's law
Ampere's law
None of these
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Question # 2
Unit of self inductance is
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Weber
Tesla
Henry
Farad
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Question # 3
When a motor is over loaded then the magnitude of back emf.
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Increases
Decreases
Remain constant
Zero
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Question # 4
Which one is not present in A.C. generator.
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Armature
Magnet
Slip rings
Commutator
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Question # 5
If speed of rotation of a generator is doubled the output voltage will be.
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Remain same
Double
Four time
One half
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Question # 6
For inducing emf in a coil the basic requirement is that:
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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 # 7
The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by
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I V
0.25 V
0.5 V
0.6 V
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Question # 8
The Direction of induced current is always so as to oppose the change which causes the current, is:
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Faraday's law
Lenz's law
Ohm's law
Kirchhoff' s1ast rule
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Question # 9
A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.
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50
100
150
200
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Question # 10
Transformer is used to change
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Electric power
Magnetic field
Alternating voltage
Phase of A.C.
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Question # 11
One henry is equal to
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1 ohm x 1 sec
1 ohm x 1 hertz
1 ohm x 1 metre
All of above
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Question # 12
The negative sign with induced emf in Faraday's law is in accordance with
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Lenz's law
Amperes law
Boyle's law
Gauss law
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Question # 13
B2/2p is the expression of.
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Lenz's law
Magnetic energy
Magnetic energy density
Back emf
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Question # 14
In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.
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NwAB
2pi f
Maximum
Zero
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Question # 15
Mutual induction play role in.
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Generator
D.C. motor
Galvanometer
Transformer
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Question # 16
Eddy current is produced when:
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A metal is light 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 circualr coil
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Question # 17
The direction of induced current is always so as to oppose the change which causes the current is:
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Faraday's law
Lenz's law
Ohm's law
Kirchhoff's 1st rule
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Question # 18
Mutual induction has a practical role in the performance of the.
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Radio choke
Transformers
A.C. Generator
D.C. Generator
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