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Which statement about the role of dust particles in cloud formation is incorrect?

Answer and explanation

Correct answer: They always destroy water vapour

Correct answer: D. Clouds form when water vapour condenses into tiny droplets or deposits as ice on suitable microscopic particles in the atmosphere. Dust particles can act as condensation nuclei: they provide surfaces on which water vapour can gather and form droplets, especially when the air is sufficiently humid and cool. Therefore, A, B, and C describe possible helpful roles of dust particles. D is incorrect because dust does not always destroy water vapour. In suitable conditions it assists the change of vapour into cloud water or ice; it does not automatically remove or destroy the water. Option A is correct as a description of nuclei, B is correct because particles provide surfaces, and C is correct because they facilitate condensation. Memory cue: nuclei are starting surfaces for droplets, not enemies that destroy vapour.

Related tags

Dust ParticlesCondensation NucleiCloud FormationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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