The colour with maximum wavelength in visible spectrum is MCQ with Answer and Explanation

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The colour with maximum wavelength in visible spectrum is

A. Green

B. Blue

C. Red

D. Violet

Answer: Option C

Solution (By JKSSB Mock Tests)

Red ~700 nm.

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Question #1

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A bimetallic strip bends on heating due to

A. Different melting points

B. Different thermal expansion coefficients

C. Different densities

D. Different specific heats

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Correct Answer: Option B

Explanation:
Bimetallic strip consists of two metals with different coefficients of linear expansion. On heating, one expands more, causing bending. Used in thermostats, fire alarms. Expansion difference causes curvature.

This question belongs to: Science Physics

Question #2

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The final image in an astronomical telescope is

A. Virtual and erect

B. Real and inverted

C. Virtual and inverted

D. Real and erect

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Correct Answer: Option C

Explanation:
Telescope forms inverted, virtual image at infinity (or near point). For terrestrial, erecting lens makes erect.

This question belongs to: Science Physics

Question #3

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Which is the most penetrating radiation?

A. Beta

B. X-rays

C. Alpha

D. Gamma

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Correct Answer: Option D

Explanation:
Gamma rays highest penetration, alpha least.

This question belongs to: Science Physics

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