The greenhouse effect is mainly due to increase in MCQ with Answer and Explanation

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The greenhouse effect is mainly due to increase in

A. Argon

B. Nitrogen

C. Carbon dioxide

D. Oxygen

Answer: Option C

Solution (By JKSSB Mock Tests)

CO2, methane trap heat.

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Question #1

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

A. 3F

B. F/3

C. 9F

D. F/9

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Correct Answer: Option D

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

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Question #2

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Heat required to convert 1 g of ice at 0°C to water at 0°C is (latent heat 80 cal/g)

A. 1 cal

B. 540 cal

C. 100 cal

D. 80 cal

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Correct Answer: Option D

Explanation:
Latent heat of fusion of ice = 80 cal/g. So 1 g needs 80 cal. No temperature change.

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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. 0.76 m

B. 0.76 cm

C. 7.6 m

D. 13.6 m

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Correct Answer: Option A

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

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