Which of the following is the major source of water pollution?
Industries
Sewage
Automobiles
Both a and b
Both sewage and industries are major sources of water pollution.
Match the following air pollutants with their major source.
(i) Carbon monoxide (ii) Carbon- dioxide (iii) Sulphur dioxide
(a) Coal burn (b) Fossil fuels (c) Automobiles
Which of the following is the major source for evaporation of water?
The non-renewable source of energy among the following is : (a) hydroelectricity (b) sewage gas (c) natural gas (d) gobar gas