Solution of Chapter 14. Water (NCERT - Science Book)

Fill up the blanks in the following:

a. The process of changing of water into its vapor is called _____.

b. The process of changing water vapor into water is called ____.

c. No rainfall for 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 on 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 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.

Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?

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?

To clean their spectacles, people often breath out on glasses to make them wet. Explain why the glasses become wet.

How are clouds formed?

When does a drought occur?