The device used to hear heartbeats is MCQ with Answer and Explanation

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The device used to hear heartbeats is

A. Telescope

B. Microscope

C. Stethoscope

D. Endoscope

Answer: Option C

Solution (By JKSSB Mock Tests)

Stethoscope amplifies sound.

This question belongs to: Science Physics

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Question #1

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Work done by a force is zero when the angle between force and displacement is

A. 90°

B. 45°

C. 0°

D. 180°

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Correct Answer: Option A

Explanation:
W = Fd cosθ, cos90° = 0, so work zero. e.g., coolie carrying load horizontally.

This question belongs to: Science Physics

Question #2

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A fuse wire is connected in which wire of the circuit?

A. Any wire

B. Phase (live)

C. Earth

D. Neutral

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Correct Answer: Option B

Explanation:
Fuse must be in live wire so that appliance is isolated when fuse blows.

This question belongs to: Science Physics

Question #3

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Which of the following is not an electromagnetic wave?

A. Gamma rays

B. Ultraviolet

C. X-rays

D. Sound waves

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Correct Answer: Option D

Explanation:
Sound waves are mechanical, require medium.

This question belongs to: Science Physics

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