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

Related Mcqs:

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

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

2. Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?

   A. 50
   B. 1000
   C. 2000
   D. 5000

3. 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

4. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?

   A. 5
   B. 50
   C. 500
   D. 5000

5. 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?

   A. 84
   B. 88
   C. 80
   D. 92

6. 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

7. ‘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

8. Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?

   A. 0.002
   B. 0.2
   C. 1.2
   D. 4.8

9. 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

10. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ______________ ppm?

    A. 1000 to 2000
    B. 3000 to 6000
    C. 6000 to 9000
    D. 10000 to 100000