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Physics FSC Part 2 Chapter 15 Online MCQ's Test MCQs With Answers
Question # 1
The magnitude of back emf:
Choose an answer
Increases with sped of motor
Decreases with speed of motor
Remains same
None of above
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Question # 2
The winding of the electromagnet in motor are usually called.
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Magnetic coils
Field coils
Electric coils
electric o electric coils
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Question # 3
If D.C. input for step up transformer, the output is
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Zero
High
Low
May be high or low
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Question # 4
1 Henry =
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VSA
-1
VS
-1
A
-1
V
-1
SA
VSA
-2
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Question # 5
The Lenz's law is also statement of:
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Law of conservation of mass
Law of conservation of charge
Law of conservation of energy
Law of conservation of momentum
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Question # 6
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 # 7
The direction of induced current is always so as to oppose the change which causes the current, this is the statement of
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Lenz's law
Faraday's law
Ampere's law
Coulomb's law
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Question # 8
Choose an answer
Lenz's law
Faraday's law
Ampere's law
None of these
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Question # 9
In A.C. inductor behaves as
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Capacitor
Resistor
Commutator
Transistor
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Question # 10
A.C. Generator based upon the
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Lenz's law
Maxwell's relation
Faradays law of electromagnet induction
Mutual induction
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Question # 11
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 # 12
When the back emf in a current is zero, it draws
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Zero current
Maximum current
Minimum current
Steady average current
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Question # 13
Electric current produces magnetic field, was suggested by.
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Faraday
Oersted
Henry
Lenz
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Question # 14
The induction can be increased by winding the wire around a core made of.
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Copper
Silicon
Iron
Aluminum
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Question # 15
Electromagnetic induction obeys law of conservation
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Charge
Energy
Momentum
Mass
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Question # 16
With the speed of motor, magnitude of back emf
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Remain same
Increase
Decrease
First increases then decreases
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Question # 17
In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:
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0.2 henry
0.1 henry
0.8 henry
0.04 henry
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Question # 18
the core of transformer is laminated so reduce.
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Magnetic loss
Hysteresis loss
Eddy current loss
Electric loss
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