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If a hill station has a cold, clear, calm night with moist air, which surface condensation is most likely in the morning?

Answer and explanation

Correct answer: Dew or frost

Answer: C, dew or frost. A clear and calm night allows the ground and exposed objects to lose heat by radiation. Moist air supplies water vapour, and cooling may bring the air or the surface to its dew point, where condensation begins. If the surface temperature remains above freezing, the water appears as liquid dew. If the surface temperature falls to freezing or below, the deposited water may become frost, or ice may form directly from water vapour. The exact choice between dew and frost requires the actual surface temperature, which the question does not give, so the combined option is safest. Option A is a strong wind carrying dust, not surface condensation. Option B is frozen precipitation formed in storm clouds, not the normal result of a calm night. Option D is a specialised phenomenon over water and is not the expected surface deposit here. Memory cue: cold plus moisture gives dew; freezing cold gives frost.

Related tags

GeographyDewFrostNight-CoolingForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereClass 12 Mcq

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