NCERT Class VI Science Solutions: Chapter 14-Water Part 2

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Question 4:

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

Answer:

The rate of evaporation increases with increase in temperature. So, near the anghiti or heater, the rate of evaporation will be higher and the uniform will dry up quickly.

Question 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?

Answer:

It is due to condensation of water vapours present in air. Air contains water in the form of vapours, when it comes in contact of cool water bottle, it gets condense and converted into water droplets.

As showin in images is a cooled bottle of water from refrige …

Cooled Bottle of Water from Refrigerator

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Question 6:

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

Answer:

When we breathe out, moist air comes out (along with energy and carbon dioxide) which make the glasses wet (as water vapours get condense on glass).

As showin in images is a glasses to make them wet

Glasses to Make Them Wet

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Question 7:

How are clouds formed?

Answer:

Evaporation takes place from all open surfaces of water. As a result, water vapour gets continuously added to air. As these vapours go higher from the surface of the earth, 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. It is these tiny droplets that remain floating in air and appear to us as clouds.

Diagram shows process of evaporation

Process of Evaporation

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Question 8:

When does a drought occur?

Answer:

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 scarce. This situation may lead to drought.

As showin in images is a result for clouds formed.

Result for Clouds Formed

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