The speed of light is maximum in MCQ with Answer and Explanation

Question Report Error

The speed of light is maximum in

A. Diamond

B. Glass

C. Water

D. Vacuum

Answer: Option D

Solution (By JKExamLibrary)

Light speed max in vacuum c = 3×10⁸ m/s. Slower in medium, v = c/n. Higher n, slower. Diamond n≈2.42, speed lowest. Vacuum n=1.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A body fully immersed in a fluid experiences an upward buoyant force equal to

A. Weight of the fluid displaced

B. Density of the body

C. Volume of the body

D. Weight of the body

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Correct Answer: Option A

Explanation:
Archimedes' principle: buoyant force = weight of fluid displaced. This force acts upward. If buoyant force ≥ weight, object floats. Submarines use ballast tanks to change weight, altering buoyancy.

This question belongs to: Science Physics

Question #2 Report Error

The process of emission of electrons from hot metal surface is called

A. Photoelectric emission

B. Secondary emission

C. Thermionic emission

D. Field emission

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Correct Answer: Option C

Explanation:
Thermionic emission: electrons emitted when metal heated to high temperature (e.g., filament in cathode ray tube). Photoelectric: light incident. Field emission: strong electric field. Secondary: bombardment by particles.

This question belongs to: Science Physics

Question #3 Report Error

The rate of change of displacement is

A. Acceleration

B. Velocity

C. Momentum

D. Speed

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Correct Answer: Option B

Explanation:
Velocity = d(displacement)/dt. Speed is rate of change of distance.

This question belongs to: Science Physics

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