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Q.
Which of the following statements are “true” ?
(a) Water vapour is present in air only during the monsoon. [[1]]
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.[[2]]
(c) The process of water changing into its vapour, is called evaporation.[[3]]
(d) The evaporation of water takes place only in sunlight.[[4]]
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.[[5]]
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Detailed Solution
The following statements are true or false:
(a) Water vapour is present in air only during the monsoon. ( )
Water vapour is always present in the air but the amount is known to vary according to the seasons of summer, winter and monsoon. So the statement is False.
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.( )
Soil has pores that contains water and air. This water evaporates as well. So the statement is False.
(c) The process of water changing into its vapour, is called evaporation.( )
Evaporation is a process where water changes into vapour due to gain of heat. So the statement is True.
(d) The evaporation of water takes place only in sunlight.( )
Evaporation is a process that occurs when heat is provided to the water. So it can happen even in the absence of sunlight. So the statement is False.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.( )
Condensation is a process where vapour changes into water due to cold atmosphere in the upper layers. So the statement is True.
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