Fill up the blanks in the following:
(a) The process of changing water into vapour is called
(b) The process of changing water vapour into water is called ..........
(c) No rainfall tor a year or more may lead to .......... in that region.
(d) Excessive rains may cause ............
State for each of the following whether it is due to evaporation or condensation.
(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 in a cold winter morning.
(d) Blackboard dries up after wiping it.
(e) Steam rising from a hot girdle when water is sprinkled on it.
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 the sunlight.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
