Which of the following colours of light has minimum wavelength? MCQ with Answer and Explanation

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Which of the following colours of light has minimum wavelength?

A. Green

B. Blue

C. Red

D. Violet

Answer: Option D

Solution (By JKSSB Mock Tests)

Violet ~400 nm, shortest in visible. Red ~700 nm, longest. Order VIBGYOR. Shorter wavelength higher frequency, more energy. Ultraviolet beyond violet.

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Question #1

The focal length of a concave mirror is 15 cm. The radius of curvature is

A. 7.5 cm

B. 15 cm

C. 45 cm

D. 30 cm

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Correct Answer: Option D

Explanation:
For spherical mirrors, R = 2f. So R = 2 × 15 = 30 cm. Sign convention: for concave mirror, f and R are negative by Cartesian convention, but magnitude 30 cm. So 30 cm is correct.

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Question #2

The dimensional formula for torque is same as

A. Power

B. Impulse

C. Force

D. Work

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Correct Answer: Option D

Explanation:
Torque = force × distance = [ML²T⁻²], same as work and energy.

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Question #3

A machine does 1000 J of work in 20 s. Power is

A. 5 W

B. 20000 W

C. 50 W

D. 20 W

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Correct Answer: Option C

Explanation:
P = 1000/20 = 50 W.

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