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What is the primary physical cause of cyclonic rainfall in the atmosphere?

Answer and explanation

Correct answer: Meeting of air masses with contrasting temperatures

Correct answer: B. Cyclonic rainfall is associated with convergence and the uplift of moist air in a low-pressure or frontal system. In the common frontal situation, a warmer, lighter air mass meets a colder, denser air mass. The warm air is forced to rise over the cold air. As it rises, pressure decreases, the air expands and cools; when it reaches saturation, water vapour condenses into cloud droplets and rainfall may develop. A is not the defining immediate cause of cyclonic rainfall. C describes relief or orographic rainfall, where mountains force air upward. D adds moisture to the atmosphere but is not the main physical lifting mechanism of a cyclone. The exact structure can vary between tropical and frontal systems, so the safest core idea is converging moist air plus upward motion. Memory cue: cyclone rainfall needs convergence, uplift, cooling and condensation.

Related tags

Cyclonic RainfallAir MassesConvergenceCondensationHydrological CycleThe Living WorldBiologyClass 11 Mcq

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