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Question
Which of the following statements are “true”?
(a) Water vapour is present in air only during the monsoon.
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.
(c) The process of water changing into its vapour, is called evaporation.
(d) The evaporation of water takes place only in sunlight.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
(a) Water vapour is present in air only during the monsoon.
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.
(c) The process of water changing into its vapour, is called evaporation.
(d) The evaporation of water takes place only in sunlight.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
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Solution
(a) Water vapour is always present in the air irrespective of seasons like monsoon, winter and summer. Depending on the season, the amount of water vapour present in the air varies.
Therefore, the given statement is false.
(b) Lakes, oceans, rivers are large sources of water. The amount of water that gets evaporated from these sources is very high as compared to the soil. Water is one of the important ingredients in the formation of the soil. Water enters the soil through rain, snow etc. and drains down into it. This water also gets evaporated.
Therefore, the given statement is false.
(c) The process of conversion of water from its liquid state into vapour or gaseous state is known as evaporation.
Therefore, the given statement is true.
(d) Evaporation is the process of conversion of water from its liquid form (state) into vapour or gaseous form (state).
This process goes on even in temperatures under the boiling point of water.
Therefore, the given statement is false.
(e) When the water vapour present in the air, comes in contact with the upper layer of air where it is cooler, it condenses to form tiny droplets of water.
- This process of conversion of water from its vapour or gaseous state into liquid state is known as condensation.
- Therefore, the given statement is true.
Therefore, the given statement is false.
(b) Lakes, oceans, rivers are large sources of water. The amount of water that gets evaporated from these sources is very high as compared to the soil. Water is one of the important ingredients in the formation of the soil. Water enters the soil through rain, snow etc. and drains down into it. This water also gets evaporated.
Therefore, the given statement is false.
(c) The process of conversion of water from its liquid state into vapour or gaseous state is known as evaporation.
Therefore, the given statement is true.
(d) Evaporation is the process of conversion of water from its liquid form (state) into vapour or gaseous form (state).
This process goes on even in temperatures under the boiling point of water.
Therefore, the given statement is false.
(e) When the water vapour present in the air, comes in contact with the upper layer of air where it is cooler, it condenses to form tiny droplets of water.
- This process of conversion of water from its vapour or gaseous state into liquid state is known as condensation.
- Therefore, the given statement is true.
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