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Photochemical smog is related to the pollution of -----
(a) soil
(b) water
(c) noise
(d) air
Water pollution is mainly caused by ----
(a) decay of bodies of aquatic animals
(b) industrial effluents
(c) excessive rain
(d) growth of phytoplankton
Which one of the following is a greenhouse gas?
(a) carbon dioxide
(b) carbon monoxide
(c) ozone
(d) oxygen
The most dangerous metal pollutant of automobile exhaust is---
(a) cadmium
(b) silver
(c) lead
(d) manganese
Which of the following is not produced as exhaust of vehicles?
(a) sulphur dioxide
(b) carbon dioxide
(c) carbon monoxide
(d) fly ash
Taj Mahal is threatened due to the effect of-----(a) chlorine
(b) sulphur dioxide
(c) oxygen
(d) hydrogen