question_answer 34)

  Which of the following is not a green house gas? (a) Methane                        (b) Carbon dioxide         (c) Carbon monoxide        (d) Ammonia

Answer:

  (d) Greenhouse effect is a process by which thermal radiations from a planetary surface, (e.g., earth) are absorbed by atmospheric greenhouse gases and are re-radiated in all the directions causing an increase in the overall temperature of the planet (earth). By percentage contribution to the greenhouse effect on the earth the four major gases are (i) Water vapour 36-70%           (ii) Carbon dioxide 9-26% (iii)  Methane 4-9%        (iv) Ozone 3-7% Other greenhouse gases are nitrous oxide  and CFC, i.e., chloroflouro carbons.