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Why is confidence important for students?
What is the main function of human heart?
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