300+ TOP MCQs on Electromagnetic Induction and Alternating Currents and Answers

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MCQs on Electromagnetic Induction and Alternating Currents :

1. How to increase the energy stored in an inductor by four times?
(A) By doubling the current
(B) This is not possible
(C) By doubling the inductance
(D) By making current √2times

Answer

Answer: (A) By doubling the current

2. Consider an inductor whose linear dimensions are tripled and the total number of turns per unit length is kept constant, what happens to the self-inductance?
(A) 9 times
(B) 3 times
(C) 27 times
(D) (frac{1}{3}) times

Answer

Answer: (B) 3 times

3. Lenz law is based on which of the following conservation
(A) Charge
(B) Mass
(C) Momentum
(D) Energy

Answer

Answer: (D) Energy

4. What will be the acceleration of the falling bar magnet which passes through the ring such that the ring is held horizontally and the bar magnet is dropped along the axis of the ring?
(A) It depends on the diameter of the ring and the length of the magnet
(B) It is equal due to gravity
(C) It is less than due to gravity
(D) It is more than due to gravity

Answer

Answer: (C) It is less than due to gravity

5. An observer is seeing the setup of an aluminium ring B facing an electromagnet A. The current I through A can be altered if

(A) B is independent of an increase or decrease of I
(B) If I increases, A will attract B
(C) If I increase, A will repel B
(D) If I decrease, A will repel B

Answer

Answer: (C) If I increase, A will repel B

6. What is the equivalent inductance of the following circuit if the pure inductance is 3.0H

(A) 9H
(B) 3H
(C) 1H
(D) 2H

Answer

Answer: (C) 1H

7. What is the need for laminating the core of a transformer?
(A) To reduce the resistance in the winding
(B) To reduce the eddy currents
(C) To reduce the hysteresis
(D) None of the above

Answer

Answer: (B) To reduce the eddy currents

8. Which of the following represent the variation of induced EMF with respect to time t if a short bar magnet is moved along its axis and has a constant velocity.

Answer

Answer: (B)

9. A wire loop is rotated in a magnetic field such that the frequency of change of direction of the induced emf is
(A) Six times per revolution
(B) Four times per revolution
(C) Twice per revolution
(D) Once per revolution

Answer

Answer: (C) Twice per revolution

10. Which of the following is the equivalent quantity of mass in electricity?
(A) Current
(B) Charge
(C) Potential
(D) Inductance

Answer

Answer: (D) Inductance

11. What is the unit of inductance?
(A) Volt/ampere
(B) Joule/ampere
(C) Volt-ampere/sec
(D) Volt-sec/ampere

Answer

Answer: (D) Volt-sec/ampere

12. What is the angle made by the plane of eddy currents with the plane of magnetic lines of force?
(A) 0°
(B) 40°
(C) 90°
(D) 180°

Answer

Answer: (C) 90°