The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?

Related Mcqs:

1. 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)

2. CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?

   A. 102
   B. 105
   C. 109
   D. 1015

3. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?

   A. CO2
   B. SO2
   C. Hydrocarbons
   D. CFC (chloro fluoro carbon)

4. TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?

   A. 0.1
   B. 25
   C. 100
   D. 1000

5. 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

6. Ozone is__________________?

   A. A primary pollutant
   B. A secondary pollutant
   C. Impervious to ultra-violet rays
   D. Both B. and C.

7. Presence of high concentration of ozone and smog in atmospheric air causes the __________________?

   A. Embrittlement & decrease of folding resistance of paper
   B. Cracking of rubber products
   C. Fading of dye on textiles
   D. Damage of electrical insulator on high tension power line

8. The upper layer of atmosphere is called the ____________________?

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

9. There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about _____________ °C/km?

   A. 0.05
   B. 1
   C. 6.5
   D. 15

10. A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?

    A. Hydrogen
    B. Carbon dioxide
    C. Ozone
    D. None of these