Question

scarce. This leads to drought.
Q. 1. Fill up the blanks in the following.
(a) The process of changing of water into its vapour is called
(b) The process of changing water vapour into water is called
(c) No rainfall for a year or more may lead to
(d) Excessive rains may cause
Q.2. 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 on a cold winter morning.
(d) Blackboard dries up after wiping it.
Ans. On breathing out, along with air water vapour is also released. The warm air from mouth when with the cool
surface of the glass, they condense to form water droplets.
Q. 7. How are clouds formed?
Ans. When the air moves up, it gets cooler and cooler. At sufficient heights, the air becomes so cool that the
water vapour present in it condenses to form tiny drops of water called droplets. Many such droplets of
0.8. When does a drought occur?
water come together and form clouds.
Ans. If it does not rain in a region for a year or more, the soil continues to lose water by evaporation and
transpiration. Since it is not being brought back by rain, the soil becomes dry. The level of water in ponds
and wells of the region goes down and some of them may even dry up. The ground water may also become
(d) floods
in that region.
(b) condensation
Ans. (a) evaporation
(c) drought
(e) Steam rising from a hot girdle when water is sprinkled on it.
(b) Evaporation
(c) Condensation
Ans. (a) Condensation
(e) Evaporation
(d) Evaporation
0.3. 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.
Ans. (a) False
(b) False
(c) True
(d) False
(e) True
So, statements (c) and (e) are 'True'.
Q. 4. Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help?
If yes, how?
Ans. The school uniform dries up quickly when spread near an anghiti or heater because the heat increases the
rate of evaporation of water in the clothes.
0.5. Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a
puddle of water around it. Why?
Ans. The cold water in the bottle condenses the warm air outside the bottle to form water droplets. These water
droplets gradually collect to form a puddle of water.
0.6. To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the
glasses become wet.

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Answer 1

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Answer 2

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Explanation:

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