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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 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
Which day is Earth Day?
What are the four major problem of students?