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Practice each question, then open the answer or worked solution.
Why do wet clothes placed on a clothesline get dry after some time? Explain.
Ans: After a while, wet clothing is hung out to dry because the sun's heat helps the water to evaporate. Evaporation is the process of converting liquid water into water vapour.
When water is maintained in direct sunlight, it absorbs heat from the sun and evaporates. However, how does water kept under the shade of a tree also gets evaporated? Explain.
Ans: Despite being under the tree during the day, water evaporates because the air surrounding the tree is heated by the presence of sunshine, causing water to evaporate from the heated air.
How do the areas covered with concrete affect the availability of groundwater?
Ans: Because seepage (entrance) of rainwater into the ground is limited in concreted regions, groundwater availability is diminished.
Why is there a need for conserving water? Give two reasons.
Ans: There is a need for conserving water because:
1. Groundwater levels are dropping as a result of climate change. As a result of the lower water levels, only a limited amount of water may be used. As a result, we need conserve water in order to raise
2. the groundwater level and address the water scarcity that will occur if the underground water level drops dramatically.
3. The world's population is rapidly increasing, and water resources are rapidly depleting. To avoid water scarcity, we must conserve more and more water and protect it for future generations.
Fill in the blanks selecting words from the following list snow, rain, clouds, vapour, evaporation, transpiration. Water, as
(i) goes into the atmosphere by the processes of (ii)
and (iii) and forms (iv) , which on condensation fall in the form of (v) and (vi) .
Ans: Fill in the blanks-
(i) vapour.
(ii) evaporation.
(iii) transpiration.
(iv) clouds.
(v) snow.
(vi) rain.
Most of the water that falls on the land as rain and snow sooner or later go back to a sea or an ocean. Explain how it happens?
Ans: Rain and snow eventually return to a sea or ocean because as snow melts from the sun, the water runs into a river, which also receives rainwater directly. All of these rivers flow for a considerable distance before joining a sea or ocean. The water that evaporates from the seas and oceans is returned to them.
Draw a diagram to show how seawater reaches a lake or pond.
Ans: Water cycle-
Dissolve two spoons of common salt in half a cup of water. Now, if you want to get the salt back, what will you do?
Ans: We can get back the salt we dissolved in water by two methods-
i. Either heating the salted water in a pan on a burner.
ii. Alternatively, keep the salted water pan in the sun.
In both ways, the water will evaporate in the form of water vapours, and the salt will have to remain back in the pan.
Explain the process of rooftop rainwater harvesting with the help of a suitable diagram.
Ans: Rooftop rainwater harvesting is the process of collecting rainy rooftop water and storing it in storage tanks via pipes. Because the water may contain soil, it is filtered. To recharge the groundwater, the pipes are sometimes placed straight into pits in the ground.
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