Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?

Related Mcqs:

1. Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?

   A. Benzopyrene
   B. Peroxyacetyl nitrate
   C. Carbon monoxide
   D. Sulphur dioxide

2. Higher concentration of nitrogen dioxide in atmospheric air causes___________________?

   A. Cancer
   B. Bronchitis
   C. Asphyxiation
   D. Corrosion

3. Which of the following acts as a natural source of air pollution ?

   A. Forest fire
   B. Deforestation
   C. Volcanic eruption
   D. None of these

4. Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?

   A. Poor visibility due to sky darkening
   B. Irritation in eyes
   C. Respiratory trouble
   D. All A., B. and C.

5. 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

6. 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

7. 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

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

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

9. The widest explosive limit is of _____________, thereby making it the most explosive gas?

   A. Acetylene
   B. Petrol vapor
   C. Hydrogen
   D. Carbon monoxide

10. Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes_______________?

    A. Foaming
    B. Odour nuisances
    C. Undesirable plant growth
    D. Turbidity