CBSE Class 12 Electromagnetic Induction Multiple Choice Questions with Answers. MCQ Questions Class 12 Electromagnetic Induction with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Electromagnetic Induction MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Electromagnetic Induction with Answers - Set - 4
Question 1:
The core of a transformer is laminated because:
(a) rusting of core may be prevented
(b) ratio of voltage in primary and secondary may be increased.
(c) energy losses due to eddy current may be minimised
(d) The weight of transformer may be reduced
Correct Answer – (C)
Question 2 :
The flux linked with a coif at any instant t is given by ∅ = 10t² – 50t + 250. The induced emf at t = 35 is:
(a) 10 V
(b) 190 V
(c) -190 V
(d) -10 V
Correct Answer – (D)
Question 3 :
When the magnetic field is parallel to a surface, then the magnetic flux through the surface is:
(a) infinite
(b) zero
(c) small but not zero
(d) large but not infinite.
Correct Answer – (B)
Question 4 :
For purely capacitive circuits, power factor is:
(a) 0
(b) -1
(c) 1
(d) infinity
Correct Answer – (A)
Question 5 :
A choke is used as a resistance in :
(a) dc circuits
(b) ac circuits
(c) both ac and dc circuits
(d) neither (a) nor (b)
Correct Answer – (B)
MCQ Questions Class 12 Electromagnetic Induction with Answers
Question 6 :
Two coils of self inductance 2 mil and 8 mil are placed so close together that the effective flux in one coil is completely linked with other. The mutual inductance between these coils is :
(a) 4 mH
(b) 16 mH
(c) 10 mH
(d) 6 mH
Correct Answer – (C)
Question 7 :
The energy stored in a 50 mH inductor carrying a current of 4 A is:
(a) 0.1 J
(b) 0.4 J
(c) 0.04 J
(d) 0.01 J
Correct Answer – (B)
Question 8 :
The magnetic flux linked with a coil is inversely proportional to the?
(a) magnetic field
(b) area of cross section
(c) number of turns
(d) none of these
Correct Answer – (A)
Question 9 :
The SI unit of magnetic flux is:
(a) T
(b) Tn-2
(c) Wb
(d) Wb m-2
Correct Answer – (C)
Question 10 :
The phase difference between the flux linkage and the emf in a rotating coil in a uniform magnetic field is:
(a) zero
(b) π/2
(c) π/4
(d) π
Correct Answer – (C)
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