Which of the following is a semiconductor? MCQ with Answer and Explanation

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Which of the following is a semiconductor?

A. Iron

B. Copper

C. Silver

D. Silicon

Answer: Option D

Solution (By JKSSB Mock Tests)

Silicon and germanium are semiconductors.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1

Mercury is used in thermometers because it

A. Is transparent

B. Has uniform expansion and is opaque

C. Wets glass

D. Has low boiling point

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Correct Answer: Option B

Explanation:
Mercury has uniform thermal expansion, visible, high boiling point (357°C). Does not wet glass.

This question belongs to: Science Physics

Question #2

LED stands for

A. Low Energy Device

B. Laser Emission Display

C. Linear Electron Device

D. Light Emitting Diode

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Correct Answer: Option D

Explanation:
LED (Light Emitting Diode) emits light when forward biased, due to recombination of electrons and holes. Efficient, long life. Used in displays, lighting. Laser is Light Amplification by Stimulated Emission of Radiation.

This question belongs to: Science Physics

Question #3

If the force of attraction between two objects each of mass 1 kg separated by 1 m is F, then force between 2 kg and 2 kg at same distance is

A. 4F

B. 8F

C. F

D. 2F

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Correct Answer: Option A

Explanation:
F ∝ m₁m₂. Initial: 1×1 = 1. New masses 2 and 2, product 4, so force = 4F. Distance unchanged. Universal gravitation F = Gm₁m₂/r².

This question belongs to: Science Physics

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