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

Related Mcqs:

1. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about ______________ ppm?

   A. < 1
   B. 10-100
   C. 100-200
   D. 100-1000

2. ‘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

3. Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?

   A. Highly
   B. Moderately
   C. Extremely
   D. Very extremely

4. Threshold limit value (TLV) of CO in air is _____________ ppm?

   A. 5
   B. 50
   C. 2000
   D. 5000

5. 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

6. TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?

   A. 0.1
   B. 25
   C. 100
   D. 1000

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

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

8. As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is _____________ μg/m3.(μg-microgram)?

   A. 10
   B. 90
   C. 800
   D. 750

9. 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

10. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre?

    A. 22
    B. 42
    C. 332
    D. 1050