- (A) 2 to 4
- (B) 8 to 12
- (C) 16 to 20
- (D) 24 to 32
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- (A) 3
- (B) 30
- (C) 7
- (D) 70
- (A) 1
- (B) 25
- (C) 150
- (D) 650
- (A) Foaming
- (B) Odour nuisances
- (C) Undesirable plant growth
- (D) Turbidity
- (A) Photochemical smog
- (B) Sulphur dioxide
- (C) Nitrogen dioxide
- (D) Dust particles
- (A) A primary pollutant
- (B) A secondary pollutant
- (C) Impervious to ultra-violet rays
- (D) Both
- (A) Sterilisation
- (B) Aeration
- (C) Disinfection
- (D) None of these
- (A) 10-7
- (B) 7 × 10-7
- (C) 107
- (D) 7 × 107
- (A) Automobile exhaust
- (B) Blanketing effect of CO2 in the atmosphere
- (C) De-forestation
- (D) Thickening of ozone layer
- (A) Ionosphere
- (B) Troposphere
- (C) Stratosphere
- (D) None of these
