31. The dispersion of pollutants in atmosphere is maximum when
- Environmental lapse rate is greater than adiabatic lapse rate
- Environmental lapse rate is less than adiabatic lapse rate
- Environmental lapse rate is equal to adiabatic lapse rate
- Maximum mixing depth is equal to zero
32. What are the air pollutants responsible for acid rain within and downwind areas of major industrial emissions?
- Hydrogen sulfide and oxides of nitrogen
- Sulphur dioxide and oxides of nitrogen
- Carbon dioxide and hydrogen sulfide
- Methane and Hydrogen sulfide
33. Which type of air pollutant is Ethylene?
- Liquid
- Solid
- Aldehydes
- Hydrocarbons
34. The important gaseous pollutant contributing to acid rains is
- SO2
- CO2
- NO2
- All of the above
35. Which of these is a natural contaminant of air?
- Dust
- Pollen Grains
- SO2
- Smoke
36. In air pollution, PAN is
- peroxy acetyl nitride
- peroxy acetyl nitrite
- peroxy acetyl nitrate
- none of the above
37. The particulate which is emitted by combustion of petroleum in automobiles and which affects hemoglobin formation is
- Mercury
- Lead
- Cadmium
- Nickel
38. During temperature inversion in atmosphere air pollutants tends to
- Accumulate above inversion layer
- Accumulate below inversion layer
- Disperse laterally
- Disperse vertically
39. Which one of the following pollutant (or) pairs of pollutants is formed due to photochemical reactions?
- O3 and PAN
- CO alone
- NH3 and CO
- PAN and NH3
40. The gaseous pollutant in air which combines with hemoglobin in blood is
- ozone
- sulphur dioxide
- carbon monoxide
- carbon dioxide