Environmental Engineering in CE
The amount of coagulant needed for coagulation of water increases with(i) Increase in turbidity of water(ii) Decrease in turbidity of water(iii) Increase in temperature of water(iv) Decrease in temperature of waterThe correct answer is

(ii) and (iii)
(ii) and (iv)
(i) and (ii)
(i)and(iv)

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Environmental Engineering in CE
Lagoons used for purification of polluted water

Use micro-organisms/bacteria in presence of dissolved oxygen
Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds
All of these
Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre

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