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Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 35 (11 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. Which of the following does not change in a transformer?

Correct Answer: D) Frequency.

2. The symbol and units of inductors are

Correct Answer: A) L (Henrys).

3. Self induced emf is always proportional to the time rate of change of the current.

Correct Answer: A) True.

4. Assertion (A):Induced e.m.f. depends on number of turns and area of the coil. Reason (R):Induced e.m.f. increases with increase in number of turns of coil.

Correct Answer: B) Both A and R are true but R is NOT the correct explanation of A.

5. Explain the concept of self-induced electromotive force.

Correct Answer: A) A changing current in a circuit induces an electromotive force in the same circuit, creating a self-induced voltage.

6. What would be the magnetic force of a pole located in the geographical south of the Earth?

Correct Answer: A) North.

7. What is the relationship between magnetic flux and induced EMF?

Correct Answer: B) The induced EMF is proportional to the rate of change of magnetic flux.

8. What effect does moving a magnet near a coil of wire have?

Correct Answer: C) It induces an electromotive force.

9. A straight wire, 2500 cm long, is mounted on an airplane flying at 125 m/s. The wire moves in a perpendicular direction through Earth's magnetic field (B = 5.0x10$^{-5}$ T). What EMF is induced in the wire?

Correct Answer: A) 0.16 volt.

10. Describe how a simple generator works using electromagnetic induction.

Correct Answer: C) A simple generator converts mechanical energy into electrical energy using electromagnetic induction.

11. A device that increases or decreases the voltage of alternating current

Correct Answer: C) Transformer.

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