Problem 13
The upper most region of the atmosphere is (a) troposphere (b) exosphere (c) stratosphere (d) ionosphere
Problem 14
The point of temperature inversion between troposphere and ionosphere is called (a) mesopause (b) stratopause (c) ionopause (d) tropopause
Problem 15
\(\mathrm{BOD}\) is connected with (a) microbes (b) organic matter (c) both (a) and (b) (d) none of these
Problem 16
Biodegradable pollutant is (a) DDT (b) domestic waste (c) aluminium foil (d) mercury salt
Problem 17
Minamata disease is caused due to the presence of \(\ldots \ldots\) in water. (a) \(\mathrm{Hg}\) (b) \(\mathrm{Pb}\) (c) \(\mathrm{Cd}\) (d) As
Problem 18
Which one of the following is an invaluable source of energy but does not cause pollution? (a) fossil fuels (b) nuclear energy (c) sun (d) petroleum.
Problem 19
Water is often treated with chlorine to (a) kill germs (b) remove hardness (c) increase oxygen content (d) remove suspended particles
Problem 20
Major sources of NOx pollutants are (a) natural gas (b) gasoline (c) combustion of coal and oil (d) all of these
Problem 21
Ozone hole refers to (a) hole in ozone layer (b) reduction in the thickness of ozone layer in stratosphere (c) reduction in the thickness of ozone layer in troposphere (d) increased concentration of ozone
Problem 22
Which of the following is a primary pollutant? (a) \(\mathrm{PAN}\) (b) aldehydes (c) \(\mathrm{CO}\) (d) \(\mathrm{H}_{2} \mathrm{SO}_{4}\)
