(i) Filtration |
(ii) Sedimentation |
(iii) Chlorination |
(iv) Addition of chemicals |
A) (i), (iii), (iv),(ii)
B) (iv), (ii), (i), (iii)
C) (ii), (iv), (i), (iii)
D) (iii), (i), (iv), (ii)
Correct Answer: C
Solution :
Water is first allowed to settle so that a sediment of impurities is formed. Then chemicals like alum and lime are added so that sediments further settle down. Then the water is filtered through sand and gravel, there by making it pure. Then it is chlorinated to make it free from germs and bacteria.You need to login to perform this action.
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