The device used to convert mechanical energy into electrical energy using electromagnetic induction is MCQ with Answer and Explanation

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The device used to convert mechanical energy into electrical energy using electromagnetic induction is

A. Generator

B. Motor

C. Rectifier

D. Transformer

Answer: Option A

Solution (By JKSSB Mock Tests)

Generator: coil rotated in magnetic field induces emf. Motor: opposite. Transformer: changes voltage, no moving parts. Rectifier: AC to DC.

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Question #1

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A ball is dropped from a height of 20 m. Time to reach ground (g=10) is

A. 1 s

B. 3 s

C. 4 s

D. 2 s

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Correct Answer: Option D

Explanation:
h = ½gt² => t = √(2h/g) = √(40/10) = √4 = 2 s. Free fall formula. Final velocity v = gt = 20 m/s.

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Question #2

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The weight of a body is maximum at

A. Centre of Earth

B. Poles

C. Same everywhere

D. Equator

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Correct Answer: Option B

Explanation:
g_pole > g_equator due to less centrifugal effect and Earth's oblateness. At centre g=0, weightless. So weight max at poles.

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Question #3

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Which of the following is an example of a non-contact force?

A. Gravitational force

B. Frictional force

C. Tension in string

D. Muscular force

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Correct Answer: Option A

Explanation:
Gravity, electrostatic, magnetic forces act without direct contact. Friction, tension, normal require contact. Field forces are non-contact.

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