Question

Question 9

In a filtration plant, water is filtered using layers of
(a) sand and clay
(b) clay and fine gravel
(c) sand and fine gravel
(d) sand, fine gravel and medium gravel

Answer 1

The answer is option (d).

In a filtration plant, water is filtered using layers of sand, fine gravel and medium gravel. The process of filtration allows water to flow through a filter, made of layers of sand, fine gravel and medium gravel. Filtration is carried out to remove the suspended impurities from water and it makes the water clear.