The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms?

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. 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

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. Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the_______________?

   A. Forestation
   B. Rain
   C. Green house effect
   D. Vegetation

5. 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

6. Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?

   A. Respiratory & lung disease
   B. Reduction in plant’s productivity owing to acid rain
   C. Corrosion of building materials
   D. All A., B. and C.

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

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

8. Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases?

   A. Reduce SO2 content in
   B. Catalytically convert SO2 to SO3 in
   C. Increase the dew point of
   D. None of these

9. Cp – Cv = R is valid for ______________ gases?

   A. Ideal
   B. Very high pressure
   C. Very low temperature
   D. All of the above

10. “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?

    A. Raoult’s
    B. Henry’s
    C. Amagat’s
    D. None of these