Aerosols present in atmospheric air may be__________________?

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. 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

3. Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called________________?

   A. Thermosphere
   B. Stratosphere
   C. Troposphere
   D. Mesosphere

4. Most of the atmospheric air pollutants are present in large quantity in__________________?

   A. Stratosphere
   B. Thermosphere
   C. Troposphere
   D. Mesosphere

5. Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?

   A. 20
   B. 100
   C. 400
   D. 200

6. ‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?

   A. Industrial chimney exhaust
   B. Automobiles exhaust
   C. Photochemical reaction in polluted atmosphere
   D. Burning of domestic fuel

7. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to – 100°C is ____________________?

   A. 10.73 kJ
   B. 16.15 kJ
   C. 18.11 kJ
   D. 18.33 kJ

8. 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

9. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?

   A. 1
   B. 3
   C. 7
   D. 20

10. Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?

    A. Hydrocarbons
    B. Hydrogen fluoride
    C. Hydrogen sulphides
    D. Nitrogen dioxide