An example of major air pollutant is
A). Oxygen
B). Carbon monoxide
C). Helium
D). Carbon dioxide
Main source of lead pollution is from
A). Sewage
B). Leaded gasoline
C). Tobacco
D). Insecticides
The filter over which sewage is sprinkled is called as
A). Trickling filter
B). Percolating filter
C). Contact bed
D). Intermittent sand filter
Gas released during Bhopal tragedy was :
A). Sodium isothiocyanate
B). Potassium isothiocyanate
C). Ethyl isocyanate
D). Methyl isocyanate
'Acid rain' is caused due to air pollution by
A). Carbon dioxide
B). Carbon monoxide
C). Methane
D). Nitrous oxide and sulphur dioxide