- (A) Filtration
- (B) Digestion
- (C) Sedimentation
- (D) Both
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- (A) Cancer
- (B) Silicosis
- (C) Respiratory disease (e.g., asthma)
- (D) Reduced crop yield
- (A) Dermatitis (skin disorder)
- (B) Cancer
- (C) Asphyxiation
- (D) Asthma
- (A) Smog & ozone
- (B) Hydrogen fluoride & nitrogen oxides
- (C) Sulphur dioxide & spray of weed killers
- (D) Carbon monoxide
- (A) Embrittlement & decrease of folding resistance of paper
- (B) Cracking of rubber products
- (C) Fading of dye on textiles
- (D) Damage of electrical insulator on high tension power line
- (A) CO, SO2 & H2S
- (B) CO2, NO & SO3
- (C) CO2, H2S & NO2
- (D) SO3, NO2 & CO2
- (A) Coal ash
- (B) Potassium cyanide
- (C) Ortho-xylene
- (D) None of these
- (A) Hydrochloric acid
- (B) Lime
- (C) Copper sulphate
- (D) Sodium sulphate
- (A) Evaporation & chemical precipitation
- (B) Biological methods & adsorption in ion exchange materials
- (C) Fixing into a solid mass with cement and sinking deep in the sea
- (D) All
- (A) Nitric acid making
- (B) Nitrogenous fertiliser
- (C) Detergent
- (D) Any of these
