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Online Tests
Ics Part 2 Physics Chapter 4 Test Online MCQs With Answers
Question # 1
The unit of induced emf is
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Ampere
Volt
Joule/coulomb
Both (b) and (c)
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Question # 2
Commentator was invented by
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Henry
Ousted
Maxwell
William sturgeon
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Question # 3
The Si unit of Mutual inductance is:
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VA
-1
S
-1
VAS
-1
VSA
-1
ASV
-1
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Question # 4
For step down transformer
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Ns>Np
Np > Ns
Ns = Np
Ns > > > Np
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Question # 5
Lenz's law deals with
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Magnitude of emf
Direction emf
Direction of induced current
Resistance
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Question # 6
Eddy current is one cause energy loss in
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A.C. generator
Transformer
D.C. motor
D.C. generator
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Question # 7
A current generator device converts:
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Mechanical energy into chemical energy
Chemical energy into electrical energy
Mechanical energy into electrical energy
Both b and c
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Question # 8
Transformer is used to change
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Electric power
Magnetic field
Alternating voltage
Phase of A.C.
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Question # 9
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 # 10
When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in
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Flux density
Electric flux
Magnetic flux
Magnetic field strength
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Question # 11
Unit of self inductance is
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Weber
Tesla
Henry
Farad
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Question # 12
The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:
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Antoclockwise
Clockwise
First Clockwise and then Antoclockwise
First anticlockwise and then Clockwise
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Question # 13
The only difference between the construction of D.C and A.C is.
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Carbon burshes
Coil
Commutator
Magnetic field
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Question # 14
Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?
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45 V
15 V
90 V
300 V
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Question # 15
A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.
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0.1 J
10 J
100 J
1000 J
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Question # 16
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 # 17
Electromagnetic induction is exactly according to law of:
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Momentum
Charge
Energy
Mass
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Question # 18
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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