Q. 75.0( 1 Vote )
A. tiny drops of water floating in air.
B. mixture of dust and water vapour.
C. particles of water vapour.
D. rain drops in air.
When we move above the surface of earth towards higher altitudes it gets cold. The air when it moves up also becomes cool. At a great height the air becomes so cold that the water vapor in it start to condense and form tiny droplets which float in the air and appear to us as clouds.
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Which of the following statements are “true”?
a. Water vapor 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 vapor condenses to form tiny droplets of water in the upper layers of air where it is cooler.NCERT Science
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b. The process of changing water vapor into water is called ____.
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a. Water drops appear on the outer surface of a glass containing cold water.
b. Steam rising from wet clothes while they are ironed.
c. Fog appearing on a cold winter morning.
d. Blackboard dries up after wiping it.
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