A lens which is thicker at center and thinner at edges is MCQ with Answer and Explanation

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A lens which is thicker at center and thinner at edges is

A. Convex

B. Concave

C. Cylindrical

D. Plano-concave

Answer: Option A

Solution (By JKSSB Mock Tests)

Convex lens converges light, thicker centre.

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Question #1

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A man of mass 60 kg stands on a weighing machine in a lift accelerating upward at 2 m/s². Reading in kg wt (g=10) is

A. 60 kg

B. 72 kg

C. 80 kg

D. 48 kg

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Correct Answer: Option B

Explanation:
Apparent weight = m(g+a) = 60×12 = 720 N. In kg wt, 720/10 = 72 kg. So machine shows 72 kg. Downward acceleration would show less.

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Question #2

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The voltage of domestic AC supply in India is

A. 110 V, 60 Hz

B. 240 V, 60 Hz

C. 220 V, 50 Hz

D. 230 V, 50 Hz

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Correct Answer: Option D

Explanation:
Standard in India: 230 V, 50 Hz (often 220-240).

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Question #3

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A simple pendulum is taken to moon. Its time period

A. Increases

B. Becomes zero

C. Remains same

D. Decreases

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Correct Answer: Option A

Explanation:
T ∝ 1/√g, g_moon < g_earth, so T increases.

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