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Online Tests
Ics Part 2 Physics Chapter 4 Test Online MCQs With Answers
Question # 1
The application of mutual induction is a.
Choose an answer
D.C. motor
Radio
Television
Transformer
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Question # 2
If we make magnetic field stronger the value of induced current is.
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Decreased
Increased
Vanishes
Remain constant
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Question # 3
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 # 4
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 # 5
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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Question # 6
If 10 A current passes through 100 mH inductor, then energy stored is.
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100 J
5 J
20 J
Zero
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Question # 7
In self induction A coil is connected in__________ with battery and a rheostat.
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Parallel
Series
Both A and B
None of above
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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's 1st rule
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Question # 9
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 # 10
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 # 11
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 # 12
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 # 13
Induced emf in A.C. generator can be increased by
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Decreasing area of coil
Decreasing magnetic field
Increasing area of coil
Slowing down speed of coil
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Question # 14
Step up transformer is used.
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Step up D.C. voltage
Step up A.C. voltage
Step up both A.C and D.C.
Step up A.C. current
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Question # 15
By winding the coil around a less magnetic core, self induction.
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Will increase
Will decrease
Remain same
First increase then decrease
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Question # 16
When a conductor moves across a magnetic field an emf is set up this emf is called.
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Variable emf
Constant emf
Back emf
Induced emf
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Question # 17
Commutator was invented in
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1834
1820
1840
1835
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