The human eye lens is MCQ with Answer and Explanation

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The human eye lens is

A. Concave

B. Convex with variable focal length

C. Convex of fixed focal length

D. Plano-convex

Answer: Option B

Solution (By JKSSB Mock Tests)

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

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Question #1

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Which of the following is a vector?

A. Speed

B. Energy

C. Distance

D. Displacement

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Correct Answer: Option D

Explanation:
Displacement has both magnitude and direction, vector. Distance is scalar (path length). Speed scalar. Energy scalar. Vector examples: velocity, force, acceleration.

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Question #2

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Free fall: height h takes time t. Height 4h takes time:

A. 4t

B. t/2

C. t

D. 2t

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Correct Answer: Option D

Explanation:
h = ½gt² ⇒ t ∝ √h. If h' = 4h, t' = √4 × t = 2t. Time doubles when height quadruples. Memory aid: 'Free fall: t ∝ √h; 4× height ⇒ 2× time'. Kinematics proportionality frequently tested in competitive exams.

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Question #3

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A 1000 W heater is used for 2 hours. Energy consumed in kWh is

A. 0.5 kWh

B. 1000 kWh

C. 2 kWh

D. 2000 kWh

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Correct Answer: Option C

Explanation:
Power = 1 kW (1000 W). Time = 2 h. Energy = Power × time = 1 × 2 = 2 kWh. 1 kWh = 3.6 × 10⁶ J, but here answer in kWh. Commercial unit.

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