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?

Related Mcqs:

1. 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)

2. 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)

3. The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________?

   A. Catalytic conversion
   B. Green house effect
   C. Global warming
   D. Both B. and C.

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

   A. 20
   B. 230
   C. 750
   D. 1500

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. The upper layer of atmosphere is called the ____________________?

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

7. 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

8. 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

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

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

10. 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