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

Question

Share Report Error

The speed of light in vacuum is

A. 3 × 10⁶ m/s

B. 3 × 10¹⁰ m/s

C. 3 × 10⁸ m/s

D. 3 × 10⁴ m/s

Answer: Option C

Solution (By JKSSB Mock Tests)

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

Request complete Subject PDF

Discuss this Question (0)

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

Practice More Physics Questions

Question #1

The unit of latent heat of fusion is

A. J

B. J/kg

C. J/°C

D. W

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Latent heat per unit mass, Q = mL => L = Q/m, unit J/kg (or cal/g). Specific latent heat. Not per degree.

This question belongs to: Science Physics

Question #2

A ship entering a river from sea will

A. Rise a little

B. Sink completely

C. Sink a little

D. Remain same

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Seawater density > river water. To displace same weight, ship sinks deeper in less dense river water.

This question belongs to: Science Physics

Question #3

Which of the following materials would have the highest electrical resistance, assuming equal length and cross-sectional area?

A. Aluminum

B. Copper

C. Nichrome

D. Silver

View Answer & Solution Discuss

Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Resistance depends on the resistivity of the material (R = ρL/A). Silver and copper are excellent conductors with very low resistivity. Aluminum is also a good conductor. Nichrome is an alloy (nickel, chromium, and often iron) with a resistivity about 60 times higher than that of copper, making it a resistor used in heating elements.

This question belongs to: Science Physics

Explore All Physics MCQs