When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?

Related Mcqs:

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

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

2. 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

3. 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

4. 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

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

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

6. 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

7. 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

8. ‘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

9. TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?

   A. 5
   B. 100
   C. 1000
   D. 2000

10. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________?

    A. Of clotting of blood
    B. Of jamming of respiratory tract
    C. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it
    incapable of absorbing oxygen
    D. It forms CO2 by combining with oxygen present in the blood