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

Question Report Error

The speed of light in vacuum is

A. 3 × 10⁴ m/s

B. 3 × 10⁸ m/s

C. 3 × 10⁶ m/s

D. 3 × 10¹⁰ m/s

Answer: Option B

Solution (By JKExamLibrary)

c = 2.9979 × 10⁸ m/s, commonly 3×10⁸ m/s. In glass slower. It's a universal constant, maximum speed. Used in relativity, E=mc².

This question belongs to: Science Physics

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1 Report Error

The scientist who proposed the planetary model of atom was

A. Dalton

B. J.J. Thomson

C. Ernest Rutherford

D. Niels Bohr

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Rutherford's gold foil experiment led to planetary model: electrons revolve around tiny positive nucleus. Bohr added quantized orbits. Thomson proposed plum-pudding model. Dalton atomic theory earlier.

This question belongs to: Science Physics

Question #2 Report Error

The heating element of an electric heater is made of nichrome because it has

A. Low resistivity and high melting point

B. High resistivity and low melting point

C. High resistivity and high melting point

D. Low resistivity and low melting point

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
High resistivity for heat generation; high melting point to withstand high temperature without melting.

This question belongs to: Science Physics

Question #3 Report Error

The pitch of a sound becomes higher if

A. Wavelength increases

B. Speed decreases

C. Frequency increases

D. Amplitude increases

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
Higher frequency → higher pitch. Amplitude increases loudness. Wavelength inversely proportional to frequency (v constant). So increasing frequency increases pitch.

This question belongs to: Science Physics

Explore All Physics MCQs