In This Post we are  providing Chapter-6 Electromagnetic Induction NCERT MCQ for Class 12 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON ELECTROMAGNETIC INDUCTION

Question 1.
The coupling co-efficient of the perfectly coupled coils is:
(a) Zero
(b) 1
(c) slightly more than 1
(d) infinite

Answer: (b) 1

Question 2.
1 henry is equal to :
(a) weber/ampere
(b) weber/Volt
(c) weber ampere
(d) None of these

Answer: (a) weber/ampere

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: (b) small but not zero

Question 4.
In the expression e = –d∅dt, the -ve sign signifies:
(a) The induced e.m.f is produced only when magnetic flux decreases
(b) The induced e.m.f opposes the change in the magnetic flux
(c) The induced e.m.f is opposite to the direction of the flux
(d) None of these

Answer: (b) The induced e.m.f opposes the change in the magnetic flux

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: (c) same as that of e–

Question 6.
Which of the following is not equal to a henry?
(a) Voltsecondampere
(b) Voltsecond2Coulomb
(c) Volt2secondCoulomb
(d) JolesecondCoulomb2Answer

Answer: (c) Volt2secondCoulomb

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: (d) 90%

Question 8.
The magnetic flux (∅) linked with a coil is related to the number of turns (N) of the coil as:
(a) f ∝ N
(b) f ∝ N-1
(c) f ∝ N2
(d) f ∝ N-2

Answer: (a) f ∝ N

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: (a) ∅ ∝ s

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) l∅
(b) ∅l
(c) ∅l
(d) None of these

Answer: (b) ∅l

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) Bπr2ω2R
(b) (Bπr2ω)28R
(c) (Bπrω)22R
(d) (Bπrω2)28R

Answer: (b) (Bπr2ω)28R

Question 12.
The role of inductance is equivalent to:
(a) inertia
(b) force
(c) energy
(d) momentum

Answer: (a) inertia

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: (a) 5 µV

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: (d) 1 ms

Question 15.
If I current is flowing inductance L, then the dimension of 32 LI² is equivalent to:
(a) charge
(b) force
(c) momentum
(d) energy

Answer: (c) momentum

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