Water is a transparent, tasteless, odourless, and nearly colourless substance, which is the main constituent of Earth's atmosphere and the fluids of most living organisms. It is vital for all known forms of life. It is present in all three states solid, liquid and gas. Water covers 71 % of the Earth's surface, mostly in seas and oceans. Small portions of water occur as groundwater, in the glaciers and the ice caps and in the air as vapour, clouds, and precipitation.

Match the following: Column A Column B 1 . India a. low rainfall 2 . Industries b. clouds 3 . Increasing population c. water pollution 4 . Evaporation d. water scarcity 5 . Deserts e. monsoons

India - monsoons In India, the availability of water varies from place to place. We get most of our water during the monsoon season from rains. Industries - water pollution Industries are one of the main causes of water pollution. Increasing population - water scarcity The increasing population is one of the reasons for increased water scarcity. Evaporation - clouds The phenomenon behind the formation of clouds is evaporation. Deserts - low rainfall Deserts receive low rainfall. Column A Column B 1 . India e. monsoons 2 . Industries c. water pollution 3 . Increasing population d. water scarcity 4 . Evaporation b. clouds 5 . Deserts a. low rainfall

colourless, odourless and transparent

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Earn 100

What is water?

Important Questions on Water

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Science>Chemistry>Water>Composition of Water

Seawater cannot be used for drinking and cooking because it contains large quantity of salts.

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Science>Chemistry>Water>Composition of Water

Give two reasons to justify-

Water at room temperature is a liquid.

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Science>Chemistry>Water>Composition of Water

At high altitudes, water boils at lower temperature. That is why food takes a longer time to get cooked in the mountains. Find out the name of a cooking appliance which increases the temperature at which water boils and thus makes cooking faster. Find out how this happens.

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Science>Chemistry>Water>Composition of Water

Sea/ocean water cannot be used for domestic use because it contains a lot of

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Science>Chemistry>Water>Composition of Water

Why is natural water not considered safe for drinking?

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Science>Chemistry>Water>Composition of Water

The water present in oceans/seas is unfit for drinking because it is

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Science>Chemistry>Water>Composition of Water

Match the following:

Column A	Column B
$1 .$ India	a. low rainfall
$2 .$ Industries	b. clouds
$3 .$ Increasing population	c. water pollution
$4 .$ Evaporation	d. water scarcity
$5 .$ Deserts	e. monsoons

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Science>Chemistry>Water>Composition of Water

While determining the boiling point of water, the teacher suggested to add some pumice stone pieces to the hard glass test tube containing water. This was done to :

EASY

Science>Chemistry>Water>Composition of Water

Why is sea/ocean water not fit for domestic use?

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Science>Chemistry>Water>Composition of Water

What are the ice and steam points of the Celsius scale?

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Science>Chemistry>Water>Composition of Water

Pure water is

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Science>Chemistry>Water>Composition of Water

Write two properties of pure water.