NEET Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs and Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution knowledge & problem-solving skills along with time management. NEET Physics Electromagnetic Induction and Alternating Currents Multiple Choice Questions
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°