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Subjects

Geography

Forms of condensation: dew, frost, fog, and mist

This Class 12 Geography topic from “Water in the Atmosphere” explains how water vapour changes into visible forms near Earth’s surface. Students learn how cooling, the dew point, relative humidity, and the availability of condensation nuclei produce dew, frost, fog, and mist. The topic distinguishes these forms by temperature, physical state, visibility, and formation conditions, including the role of surface cooling, calm air, and suspended droplets or ice crystals. It also helps students understand their effects on weather, visibility, agriculture, and daily life.

Easy · Level 9 · 25 questions

Practice questions

01What is the common initial requirement for both frost and dew formation?

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02Formation of fog and its later lifting is most related to which daily change?

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03Why is it wrong to call mist only water vapour?

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04If dew on leaves disappears soon after sunrise, what is the process sequence?

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05Why is the lower air layer important in fog formation?

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06Dew and frost both form on surfaces, so why are they differentiated?

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07Why are fog and mist considered forms of condensation?

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08If water droplets are found on cold grass on a hill slope in the morning but no visible haze is present in air what is the correct identification?

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09Fog near the ground and a cloud at height are mainly distinguished on what basis?

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10If white crystals are seen on plants but liquid droplets are not seen, what is the correct identification?

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11Dew and frost both form on surfaces, yet what is their main difference?

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12What is the most important difference between fog and rainfall?

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13Why are fog and mist not usually considered rainfall?

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14Why is low temperature alone not sufficient for frost formation?

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15If a farmer covers crops during a frost warning, what is the main purpose?

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16If moist air reaches cold grass and the grass temperature falls to the dew point above 0°C, what will form?

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17What is the fundamental difference between dew and fog?

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18If visibility becomes very low and nearly less than (1) kilometre, it is generally associated with what?

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19Why can dew disappear quickly after sunrise?

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20When will a white layer on a cold road at night be called frost instead of dew?

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21Why is fog called a cloud formed near the ground?

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22If liquid droplets appear on a car roof after a cold night and temperature is above freezing, what is it?

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23If the same car roof has a white icy layer and the surface is below (0°C), what will it be?

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24What is the main phase-change difference between dew and frost?

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25If morning fog is limited to the area above a river, what is the most suitable explanation?

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