The human eye lens is MCQ with Answer and Explanation

The human eye lens is

A. Convex with variable focal length

B. Plano-convex

C. Convex of fixed focal length

D. Concave

Answer: Option A

Eye lens is convex, focal length changed by ciliary muscles (accommodation).

This question belongs to: Science Physics

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Question #1 Report Error

The power of accommodation of the eye is due to

A. Change in cornea

B. Change in curvature of lens

C. Change in pupil size

D. Change in retina

Correct Answer: Option B

Explanation:
Ciliary muscles change lens shape, altering focal length.

This question belongs to: Science Physics

Question #2 Report Error

The gravitational force between two masses is F. If the distance is tripled, force becomes

A. F/9

B. F/3

C. 3F

D. 9F

Correct Answer: Option A

Explanation:
F ∝ 1/r², so if r→3r, F→F/9.

This question belongs to: Science Physics

Question #3 Report Error

The unit of electric power can be expressed as

A. Coulomb × volt

B. Joule × second

C. Ohm × meter

D. Volt × ampere

Correct Answer: Option D

Explanation:
P = V I, so watt = volt × ampere.

This question belongs to: Science Physics