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Q.

Which of the following is not used as a layer in the filtration tank during the process of water purification?

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a

Gravel

b

Cement

c

Fine sand

d

Coarse gravel

answer is B.

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Detailed Solution

  • Filtration is the third step in the water purification process.
  • The filtration tank has three layers. 
  • Coarse gravel is placed at the bottom of the tank. Above it is placed fine gravel and on the top of gravel is placed a thick layer of fine sand. 
  • These layers of sand and gravel act as filters. 
  • The impure water is introduced at the bottom. 
  • As the water rises above, all the impurities present in the water are retained and the pure water leaves the tank at the top.

 

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