Check the below NCERT MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction with Answers Pdf free download. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. We have provided Electromagnetic Induction Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.
Electromagnetic Induction Class 12 MCQs Questions with Answers
Electromagnetic Induction Class 12 MCQ Question 1.
The coupling co-efficient of the perfectly coupled coils is:
(a) Zero
(b) 1
(c) slightly more than 1
(d) infinite
Answer
Answer: (b) 1
Class 12 Physics Chapter 6 MCQ Question 2.
1 henry is equal to :
(a) \(\frac{weber}{ampere}\)
(b) \(\frac{weber}{Volt}\)
(c) weber ampere
(d) None of these
Answer
Answer: (a) \(\frac{weber}{ampere}\)
Electromagnetic Induction MCQ Question 3.
The magnetic field is parallel to a surface, then the magnetic flux through the surface is :
(a) zero
(b) small but not zero
(c) infinite
(d) large but not infinite
Answer
Answer: (b) small but not zero
MCQ On Electromagnetic Induction Class 12 Question 4.
In the expression e = –\(\frac{d∅}{dt}\), the -ve sign signifies:
(a) The induced emf is produced only when magnetic flux decreases
(b) The induced emf opposes the change in the magnetic flux
(c) The induced emf is opposite to the direction of the flux
(d) None of these
Answer
Answer: (b) The induced emf opposes the change in the magnetic flux
Ch 6 Physics Class 12 MCQ Question 5.
An e– and a p– are moving parallel to each other in a magnetic field. The magnetic force acting on the p+ is:
(a) 1840 times that on e–
(b) less than that of e–
(c) same as that of e–
(d) slightly more than that of e–
Answer
Answer: (c) same as that of e–
Chapter 6 Physics Class 12 MCQ Question 6.
Which of the following is not equal to a henry?
(a) \(\frac{Volt second}{ampere}\)
(b) \(\frac{Volt second^2}{Coulomb}\)
(c) \(\frac{Volt^2 second}{Coulomb}\)
(d) \(\frac{Jole second}{Coulomb^2}\)
Answer
Answer: (c) \(\frac{Volt^2 second}{Coulomb}\)
Electromagnetic Induction MCQs Class 12 Question 7.
A transformer is used to light 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A. Then the efficiency of the transformer is:
(a) 11%
(b) 50%
(c) 80%
(d) 90%
Answer
Answer: (d) 90%
Physics Class 12 Chapter 6 MCQ Question 8.
The magnetic flux (∅) linked with a coil is related to the number of turns (N) ofthe coil as:
(a) f ∝ N
(b) f ∝ N-1
(c) f ∝ N2
(d) f ∝ N-2
Answer
Answer: (a) f ∝ N
MCQ Of Electromagnetic Induction Question 9.
The magnetic flux (∅) lined with a coil is related to its area (s) as:
(a) ∅ ∝ s
(b) ∅ ∝ s²
(c) ∅ ∝ s1/2
(d) ∅ ∝ s-1/2
Answer
Answer: (a) ∅ ∝ s
Class 12 Physics Chapter 6 MCQ Questions Question 10.
If the magnetic flux linked with a coil through which a current off ampere is set up is ∅, then the coefficient of self-inductance of the coil is:
(a) \(\frac{l}{∅}\)
(b) \(\frac{∅}{l}\)
(c) ∅l
(d) None of these
Answer
Answer: (b) \(\frac{∅}{l}\)
Class 12 Physics Ch 6 MCQ Question 11.
In a uniform magnetic field B, a wire in the form of a semicircle of radius r rotated about the diameter of the circle with angular frequency ‘ω’. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R the mean power generated per period of rotation is :
(a) \(\frac{Bπr^2ω}{2R}\)
(b) \(\frac{(Bπr^2ω)^2}{8R}\)
(c) \(\frac{(Bπrω)^2}{2R}\)
(d) \(\frac{(Bπrω^2)^2}{8R}\)
Answer
Answer: (b) \(\frac{(Bπr^2ω)^2}{8R}\)
Physics Chapter 6 Class 12 MCQ Question 12.
The role of inductance is equivalent to:
(a) inertia
(b) force
(c) energy
(d) momentum
Answer
Answer: (a) inertia
MCQ Questions For Class 12 Physics Chapter 6 Question 13.
A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 rad s-1 . If the horizontal component of earth’s magnetism is 2 × 10-5 T, then e.m.f. developed between the two ends of the conductor is:
(a) 5 µV
(b) 50 µV
(c) 5 mV
(d) 50 mV
Answer
Answer: (a) 5 µV
Electromagnetic Induction MCQs Question 14.
coil of L = 8.4 mH and R = 6 Ω is connected to a 12 V battery. The current in the coil is 1.0 A at approx’time of:
(a) 500 s
(b) 20 s
(c) 35 ms
(d) 1 ms
Answer
Answer: (d) 1 ms
Class 12 Physics Electromagnetic Induction MCQ Question 15.
If I current is flowing inductance L, then the dimension of \(\frac{3}{2}\) LI² is equivalent to:
(a) charge
(b) force
(c) momentum
(d) energy
Answer
Answer: (c) momentum
Electromagnetic Induction MCQ Class 12 Question 16.
The phase difference between the flux linkage and the emf in a rotating coil in a uniform magnetic field is:
(a) zero
(b) \(\frac{π}{2}\)
(c) \(\frac{π}{4}\)
(d) π
Answer
Answer: (c) \(\frac{π}{4}\)
Class 12 Electromagnetic Induction MCQ Question 17.
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)
Answer
Answer: (b) ac circuits
Chapter 6 Class 12 Physics MCQ Question 18.
The SI unit of magnetic flux is:
(a) T
(b) Tn-2
(c) Wb
(d) Wb m-2
Answer
Answer: (c) Wb
MCQ Questions On Electromagnetic Induction Class 12 Question 19.
For purely capacitive circuits, power factor is:
(a) 0
(b) -1
(c) 1
(d) infinity
Answer
Answer: (a) 0
MCQ Of Chapter 6 Physics Class 12 Question 20.
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
Answer
Answer: (a) magnetic field
Electromagnetic Induction Class 12 MCQ Pdf Download Question 21.
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.
Answer
Answer: (b) zero
Question 22.
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
Answer
Answer: (b) 0.4 J
Question 23.
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
Answer
Answer: (d) -10 V
Question 24.
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
Answer
Answer: (c) 10 mH
Question 25.
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
Answer
Answer: (c) energy losses due to eddy current may be minimised
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