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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 ____________ in that region.
(d) Excessive rains may cause __________
(e) Water disappears from wet clothes by the process of _______________
(f) In winter mornings , __________is formed due to condensation of water vapour near the ground.
(g) The major natural source of water is ________________
(h) Many tiny water droplets high up in the air, come together and fall down as _______, __________ and ______
(g) oceans and sea
(h) rain, hail, snow
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.
Water drops appear on the outer surface of a glass containing cold water.
Steam rising from wet clothes while they are ironed
Fog appearing on a cold winter morning
Blackboard dries up after wiping it
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 sunlight.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler
(f) Life is possible on earth without water
(g) When water is heated, it changes into ice.
(h) Evaporation of water takes place at all times.
(i) Saline water is fit for drinking and other domestic, agricultural and industrial needs.
(j) About two-thirds of the earth is covered with water.
Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?
Yes, spreading school uniform near anghiti or heater would help dry it quickly. Heater will warm up the surroundings and increase the rate of evaporation. This will lead to quick drying of the school uniform
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?
The phenomenon here is condensation. It is the process of converting water vapour into water. The cold surface of the bottle cools the air around it, and the water vapour of the air condenses on its surface.
To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.
When we breathe out, moist air comes out which make the glasses wet. Also when we breathe out, we release carbon-dioxide gas which cools the surroundings by absorbing heat from air, thus condenses the water vapours.
How are clouds formed?
Clouds are formed due to the process of evaporation, transpiration and condensation.
1) First water is evaporated from the ocean and water vapour goes up
2) When air moves up, it gets cooler and cooler. At sufficient height, the air becomes so cool that water vapours present in the air condense. They form tiny droplets and These ting droplets float in air as clouds.
When does a drought occur?
1) When there is insufficient or no rainfall occurs for more than a year in a region, the scarcity of water happens.
2) Ponds and wells dry up.
3) The soil continues to lose water due to evaporation and transpiration and eventually dry.
This leads to drought in the region
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