Satellites burn off during re-entry to earth’s atmosphere, because of the ____________________?

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. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?

   A. Acts as a green house gas thereby raising earth’s temperature
   B. Causes asphyxia
   C. Causes increase in sea level
   D. Enhances the green house effect

3. 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

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

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

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 maximum CO2 is emitted into the atmosphere by_________________?

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

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

   A. 10
   B. 200
   C. 1000
   D. 2000

8. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?

   A. Paralysis of muscles & loss of appetite
   B. Nervous depression
   C. Gastritis and diarrhea
   D. All A., B. and C.

9. 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

10. Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0°C will be _______________ atmosphere?

    A. 0.5
    B. 1
    C. 1.5
    D. 2