- (A) Biological oxygen pond
- (B) Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
- (C) Lagoons
- (D) Filtration
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- (A) Bronchitis
- (B) Silicosis
- (C) Pneumoconiosis
- (D) None of these
- (A) Grit
- (B) Dust
- (C) Powder
- (D) Smoke
- (A) June
- (B) December
- (C) July
- (D) September
- (A) Alum
- (B) Bleaching powder
- (C) Activated carbon
- (D) Copper sulphate
- (A) Dental cavities
- (B) Scale formation
- (C) Water-borne disease
- (D) Corrosion
- (A) Coagulation and flocculation of colloids
- (B) Oxidation of carbonaceous matter to CO2
- (C) Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter to the nitrite and eventually to the nitrate
- (D) All
- (A) 0.001
- (B) 0.1
- (C) 1
- (D) 5
- (A) Reduction in its dissolved oxygen content
- (B) Discoloration of bathroom fixtures
- (C) Temporary hardness
- (D) None of these
- (A) Undesirable plants growth
- (B) Depletion of oxygen
- (C) Fire hazards
- (D) Explosion hazards
