safe handling and storage of water

SAFE HANDLING AND STORAGE OF WATER
D1.State the meaning of the term potable water.
Ans: Water which is clean,germ free and fit for drinking is called potable water.
D2.Name any two diseases that can be caused by drinking unclean water.
Ans:Two diseases that can be caused by drinking unclean water are diarrhea and jaundice
D3.Name the diseases which are spread by mosquitoes.
Ans:The diseases spread by mosquitoes are malaria, dengue, chikungunya and filaria.
D4. How does boiling help in making water safe for drinking?
Ans:Boiling kills the germ present in water and make safe for drinking.
D5.Name two methods of purification of water.
Ans:Two methods of purification of water are boiling and chlorination.
D6.Name any two ways of safe handling of drinking water.
Ans:Ways of safe handling of drinking water are:
i)Water should be stored in clean and covered container.
ii)we should not dip our hand in water stored for drinking .
iii)We should use ladle to take out water from the container.
E1.Why should water be purified before drinking?
Ans:Water should be purified before drinking because purification makes the water clean and germ free and it is safe for drinking.
E2.What is chlorination ?How does it purify water?
Ans:Addition of correct amount of chlorine to water is called chlorination. Chlorination kills the germs present in water and make it safe for drinking.
E3.Why is the traditional method of filteration not completely sufficient for making water fit for drinking?
Ans:The traditional method of filtration is not completely sufficient for making water fit for drinking because it only removes dust and suspended particle but does not remove germs.
E4.why should we not allow water to stagnate water around our houses?
Ans:Stagnate water is abreeding ground for mosquitoes and they spread malaria, dengue,chikungunuya ,So water should not be allowed to stagnate around our houses.
E5.State two ways that can be used to prevent breeding of mosquitoes in room coolers.

Ans:The water of room cooler must be changed after every 3-4 days or when Water cannot be changed two spoons of kerosene should be put in it to prevent breeding of mosquitoes in room coolers.

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