Q.1 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 _________________.
NCERT Solutions for Class 6 Science Chapter 14 Water
Answer :
(a) The process of changing of water into its vapor is called evaporation.
(b) The process of changing water vapor into water is called condensation.
(c) No rainfall for a year or more may lead to drought in that region.
(d) Excessive rains may cause floods.
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.
(e) Steam rising from a hot girdle when water is sprinkled on it.
NCERT Solutions for Class 6 Science Chapter 14 Water
Answer :
1. Condensation
2. Evaporation
3. Condensation
4. Evaporation
5. Evaporation
Q.3 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 vapor, 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 Solutions for Class 6 Science Chapter 14 Water
Answer :
a) False
b) False
c) True
d) False
e) True
NCERT Solutions for Class 6 Science Chapter 14 Water
Answer :
The process of condensation plays an important role in formation of cloud. As water vapour goes higher from the surface of the earth, it gets cooler. 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 water droplets. It is these tiny droplets that remain floating in air and appear to us as clouds.