Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?

Related Mcqs:

1. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?

   A. Ionosphere
   B. Troposphere
   C. Stratosphere
   D. None of these

2. The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?

   A. Anaerobic
   B. Saprophytic
   C. Aerobic
   D. Parasitic

3. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?

   A. CO
   B. SO2
   C. NOx
   D. CFC (chloro fluoro carbons)

4. Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?

   A. CO2
   B. H2
   C. SO3
   D. N2

5. Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?

   A. Thermal power plant
   B. Petroleum refinery
   C. Nitric acid plant
   D. Sulphuric acid plant

6. Which of the following pollutants, if present in atmosphere is detectable by its odour ?

   A. CO
   B. SO2
   C. NO2
   D. CO2

7. Which of the following is not a source of ozone emission in the atmosphere?

   A. Refrigerators
   B. Xerox machines
   C. Dermatological photo-therapy equipments
   D. High voltage electrical equipments

8. Hazardous/polluting chemical industries should have an ‘exclusion zone’ with a green belt and general public access prohibited around it, covering a radius of _____________ metres?

   A. 100
   B. 1000
   C. 400
   D. 4000

9. The lowest layer of atmosphere is known as the_____________________?

   A. Stratosphere
   B. Troposphere
   C. Ionosphere
   D. None of these

10. The maximum CO2 is emitted into the atmosphere by_________________?

    A. Combustion
    B. Urea
    C. Biomass burning
    D. Trees