A. 1
B. 7
C. 19
D. 82
Related Mcqs:
- 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 - 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 - Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?
A. Highly
B. Moderately
C. Extremely
D. Very extremely - Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is _____________ decibels?
A. 35
B. 75
C. 95
D. 105 - 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 - ‘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 - Maximum permissible residual chlorine in treated water should be ____________ mg/litre?
A. 0.001 to 0.01
B. 0.2 to 0.3
C. 2 to 3
D. 5 to 10 - The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about ____________ decibels?
A. 60
B. 90
C. 105
D. 120 - 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 - 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
