The principle of AC generator is MCQ with Answer and Explanation

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The principle of AC generator is

A. Thermoelectric effect

B. Electromagnetic induction

C. Self induction

D. Mutual induction

Answer: Option B

Solution (By JKSSB Mock Tests)

Changing flux induces emf.

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Question #1

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Which defect of vision is correctly matched with its correcting lens?

A. Hypermetropia - Concave lens

B. Myopia - Convex lens

C. Myopia - Concave lens

D. Presbyopia - Cylindrical lens

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Correct Answer: Option C

Explanation:
Myopia (near-sightedness) occurs when the image is focused in front of the retina. It is corrected using a concave (diverging) lens. Hypermetropia (far-sightedness) is corrected with a convex (converging) lens. Astigmatism is corrected with a cylindrical lens. Presbyopia is usually corrected with bifocal lenses.

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Question #2

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The force between two charges in vacuum is F. If a medium of dielectric constant 4 is introduced, force becomes

A. 4F

B. F/4

C. F/2

D. 2F

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Correct Answer: Option B

Explanation:
F_medium = F_vacuum / K.

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Question #3

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Which of the following is a renewable source of energy?

A. Nuclear fuel

B. Petroleum

C. Coal

D. Solar energy

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Correct Answer: Option D

Explanation:
Solar, wind, hydro, biomass renewable. Coal, oil, natural gas fossil fuels, non-renewable. Nuclear fuel uranium finite. Renewable replenish naturally.

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