NEET Questions Solved

NEET - 2011

Which one of the following pairs of gases are the major cause of Green house effect?
(a) CO2 and CO
(b) CFCs and SO2
(c) CO2 and N20
(d) CO2 and O3

(c) The phenomenon of keeping the earth warm due to presence of certain radiatively gases in the atmosphere is called green house effect (Fourier, 1827). The name is based after a similar warmer interior in a glass-enclosed green house where glass panes, CO2 and water vapour allow the solar radiations to enter but prevent the escape of long wave heat radiations. CO2 and N2O are the major cause of "green house effect". CO2 contributes 60% of total global warming. N2O contributes 6% to green house effect.

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