A. Oxides of sulphur
B. Oxides of nitrogen
C. Carbon monoxide
D. Hydrogen sulphide
A. Use of silencers
B. Green house gases
C. Vibration damg
D. Tree plantation
A. Hydrocarbons
B. Hydrogen fluoride
C. Hydrogen sulphides
D. Nitrogen dioxide
A. 20
B. 100
C. 400
D. 200
A. 90
B. 120
C. 150
D. 180
A. Stratosphere
B. Thermosphere
C. Troposphere
D. Mesosphere
A. Foul smell and taste
B. Iron and manganese
C. Temporary hardness
D. Permanent hardness
A. Thermosphere
B. Stratosphere
C. Troposphere
D. Mesosphere
A. Silica
B. Turbidity
C. Phenol
D. Dissolved oxygen
A. Separation
B. Anaerobic decomposition
C. Aerobic decomposition
D. None of these