Water — Practice

Question 1

Name the four stages of the water cycle in order.

Accepted Answer

Evaporation, condensation, precipitation and collection.

Question 2

What is evaporation?

Accepted Answer

Water turning into water vapour when heated by the Sun.

Question 3

Name the three stages of water purification.

Accepted Answer

Sedimentation, filtration and chlorination.

Question 4

Name two diseases spread by polluted water.

Accepted Answer

Cholera and typhoid (also diarrhoea).

Question 5

How is a cloud formed?

Accepted Answer

Water vapour rises, meets colder air and condenses into tiny droplets. Millions of these droplets together form a cloud.

Question 6

What happens during filtration, and why is chlorine added afterwards?

Accepted Answer

In filtration the water passes through sand, gravel and charcoal, which trap smaller particles and some germs. Chlorine is then added to kill the germs that remain.

Question 7

Name the three main sources of water pollution.

Accepted Answer

Domestic sewage from houses, industrial waste from factories, and agricultural runoff carrying fertilisers and pesticides.

Question 8

Give three ways of saving water at home.

Accepted Answer

Close the tap while brushing, repair leaking taps promptly, and use a bucket instead of a running hose to wash a vehicle.

Question 9

A student says evaporation only happens from the sea. Correct this statement.

Accepted Answer

Evaporation happens from every wet surface. Rivers, lakes, ponds, puddles, wet clothes and even sweat on skin all evaporate, and plants release water vapour from their leaves too.

Question 10

Why do wells run dry in places where it still rains every year?

Accepted Answer

Groundwater is simply rainwater that has soaked into the ground. If it is pumped out faster than rain can replace it, the water table falls year after year and wells dry up, even though rain still falls.

Question 11

What is rainwater harvesting and why is it compulsory for buildings in Tamil Nadu?

Accepted Answer

It is collecting rain, usually from rooftops, and letting it soak back into the ground. It is compulsory because groundwater in Tamil Nadu has been drawn down faster than it is replaced, and harvesting helps refill it.

Practice — Water

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