Which of the following is an application of electromagnetic induction? MCQ with Answer and Explanation

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Which of the following is an application of electromagnetic induction?

A. Moving coil galvanometer

B. Dynamo

C. Electric bell

D. Electric fuse

Answer: Option B

Solution (By JKSSB Mock Tests)

Dynamo/generator converts mechanical to electrical energy using induction.

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Question #1

The SI unit of charge is

A. Coulomb

B. Ohm

C. Ampere

D. Volt

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Correct Answer: Option A

Explanation:
Coulomb (C).

This question belongs to: Science Physics

Question #2

Two parallel wires carrying direct currents in the opposite directions will:

A. Have no effect on each other

B. Repel each other

C. Rotate perpendicular to each other

D. Attract each other

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Correct Answer: Option B

Explanation:
According to Ampere's force law, parallel wires carrying currents in the SAME direction create magnetic fields that attract each other. Conversely, parallel wires carrying currents in OPPOSITE directions create magnetic fields that push against each other, causing the wires to repel. Exam tip: 'Same' Attracts, 'Opposite' Repels (reverse of charges!).

This question belongs to: Science Physics

Question #3

The escape velocity for a projectile on the Earth's surface is 11.2 km/s. If a body is projected at twice this velocity, what happens?

A. It returns to Earth after a long time.

B. It orbits the Earth indefinitely.

C. It escapes Earth's gravity and retains a finite positive velocity in interstellar space.

D. It escapes Earth's gravity but eventually comes to rest in deep space.

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Correct Answer: Option C

Explanation:
Escape velocity (Ve) is the minimum velocity needed to overcome Earth's gravitational pull so that final velocity at infinity is zero. If launched with velocity v > Ve, the body will escape and, due to conservation of energy, retain a residual speed (v_infinity) at an infinite distance, calculated by v_infinity = √(v² - Ve²). Here, v = 2Ve, so it retains speed.

This question belongs to: Science Physics

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