Water in the Atmosphere

Movement of air replaces the saturated layer with the unsaturated layer. Hence, the greater the movement of air, the greater is the evaporation.
Thus, statement c is incorrect. This is the correct answer choice.

This is incorrect. Evaporation is a type of vaporisation of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance.
The temperature at which saturation occurs in a given sample of air is known as dew point.
Thus, dew point is not a type of vaporization of a liquid.

This is the correct answer, as statement 'a' is incorrect. The absolute humidity differs from place to place on the surface of the earth. The percentage of moisture present in the atmosphere as compared to its full capacity at a given temperature is known as the relative humidity.

Condensation takes place when the dew point is lower than the freezing point as well as higher than the freezing point.

This is the correct answer choice. When moist air is cooled, it may reach a level when its capacity to hold water vapour ceases. Then, the excess water vapour condenses into liquid form. If it directly condenses into solid form, it is known as sublimation.

No, saturation occurs at this point. Saturation occurs when air at the given temperature is incapable of holding any additional amount of moisture at that stage.

Frost forms on cold surfaces when condensation takes place below freezing point.

This is the correct answer, as both these statements are correct. When the moisture is deposited in the form of water droplets on cooler surfaces of solid objects it is known as dew. The ideal conditions for the formation of dew are clear sky, calm air, high relative humidity, and cold and long nights.

This is the correct answer, as both these statements are correct.

This is the correct answer, as all the statements given are incorrect. 
Mist, not fog is frequent over mountains as the rising warm air up the slopes meets a cold surface.
Fogs, mot mists are prevalent where warm currents of air come in contact with cold currents.
Fogs, not smogs are mini clouds in which condensation takes place around nuclei provided by the dust, smoke, and the salt particles.

This is correct, as all these statements are correct.
The only difference between the mist and fog is that mist contains more moisture than the fog.
In mist each nuclei contains a thicker layer of moisture.
The fog is a cloud with its base at or very near to the ground.

This is the correct, as all the statements are correct. Cirrus clouds are formed at high altitudes. They are thin and detatched
clouds having a feathery appearance. They are always white in colour.

This is the correct answer, as both these statements are correct.
Cumulus clouds look like cotton wool.
They have a flat base.

This is correct about stratus clouds. Stratus clouds are layered cloudscovering large portions of the sky. 

This is the correct answer, as both statements are correct.
Nimbus clouds are black or dark gray.
Nimbus clouds are extremely dense and opaque to the rays of the sun.

Cumulonimbus is a cloud with extensive vertical development.

Sleet is frozen raindrops and refrozen melted snow-water.

This is the correct answer, as the statements are correct.
Convectional rainfall is very common in the equatorial regions and interior parts of the continents, particularly in the northern hemisphere.
Convectional rainfall is common in the summer or in the hotter part of the day.
Convectional rainfall takes place with thunder and lightening and does not last long.

No, this statement is incorrect. The rainfall goes on decreasing, not increasing steadily from the equator towards the poles.

A - 4, B - 1, C - 3, D - 2 is the correct matching. Cirrus clouds are thin and detached clouds having a feathery appearance. Nimbus clouds are shapeless masses of thick vapour. Cumulus clouds look like cotton wool. Stratus clouds are layered clouds covering large portions of the sky.

This is the correct answer, as both these statements are incorrect.The chief characteristics of orographic rain are that windward slopes receive greater rainfall, and leeward side remains rainless and dry.