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Medium · Level 20 · high pressure,fog,stable air,condensation,Forms of condensation: dew, frost, fog, and mist,forms of condensation dew frost fog and mist,Water in the Atmosphere,GeographyView options
When the air is stable and surface cooling is present
When air rises very rapidly
When atmospheric pressure completely disappears
When there is no water vapour at all
Medium · Level 20 · air convergence,cloud formation,rising air,condensation,Forms of condensation: dew, frost, fog, and mist,forms of condensation dew frost fog and mist,Water in the Atmosphere,GeographyView options
When air rises and cools
When air descends and warms
When air does not move at all
When pressure becomes equal
Hard · Level 20 · air-mass stability,mist,low clouds,Forms of condensation: dew, frost, fog, and mist,forms of condensation dew frost fog and mist,Water in the Atmosphere,Geography,Class 12 MCQView options
Under which condition can fog form near a cold surface even under high pressure?
Correct answer: A
High-pressure conditions often produce sinking, stable air and light winds. If the surface cools the air immediately above it to its dew point, water vapour condenses into tiny droplets near the ground and radiation or advection fog may form. Thus, high pressure does not prevent fog when sufficient moisture, cooling, and stability occur. Option A gives all the essential conditions.
In which condition does air convergence help more cloud formation?
Correct answer: A
At the surface, convergence means that more air is moving into a region than is moving away from it. Because air cannot continue accumulating indefinitely at the ground, it is forced to rise. Rising air expands and cools adiabatically; if it reaches saturation, water vapour condenses on condensation nuclei and clouds develop. Thus, convergence promotes cloud formation mainly when it produces rising and cooling air, making option A correct.
Under what condition can an air mass become stable and produce widespread mist or low clouds?
Correct answer: A
When moist air moves slowly across a colder land or water surface, it is cooled from below. Cooling increases relative humidity and may bring the air to saturation, while the stable layering suppresses strong vertical mixing. Condensation near the surface can then produce widespread mist, fog, or low stratus cloud.
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