A lens has power +1 D. Its focal length in cm is MCQ with Answer and Explanation

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A lens has power +1 D. Its focal length in cm is

A. 100 cm

B. 1 cm

C. 0.1 cm

D. 10 cm

Answer: Option A

Solution (By JKExamLibrary)

f = 1/P = 1 m = 100 cm.

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Question #1

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The weight of a body is maximum at

A. Equator

B. Same everywhere

C. Poles

D. Centre of Earth

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Correct Answer: Option C

Explanation:
g_pole > g_equator due to less centrifugal effect and Earth's oblateness. At centre g=0, weightless. So weight max at poles.

This question belongs to: Science Physics

Question #2

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The scientist who proposed the planetary model of atom was

A. Niels Bohr

B. Dalton

C. Ernest Rutherford

D. J.J. Thomson

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Correct Answer: Option C

Explanation:
Rutherford's gold foil experiment led to planetary model: electrons revolve around tiny positive nucleus. Bohr added quantized orbits. Thomson proposed plum-pudding model. Dalton atomic theory earlier.

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Question #3

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Atmospheric pressure at sea level is 1.013×10⁵ Pa. Equivalent height of mercury column (density 13600 kg/m³, g=9.8) is

A. 7.6 m

B. 0.76 m

C. 0.76 cm

D. 13.6 m

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Correct Answer: Option B

Explanation:
P = ρgh => h = P/(ρg) = 1.013×10⁵/(13600×9.8) ≈ 0.76 m = 76 cm.

This question belongs to: Science Physics

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