A. 10
B. 90
C. 800
D. 750
Related Mcqs:
- 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 - ‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a „particulate‟ ?
A. Dust & mists
B. Smoke & fumes
C. Photochemical smog & soot
D. None of these - Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is _____________ decibels?
A. 35
B. 75
C. 95
D. 105 - 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 - 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 - Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?
A. Highly
B. Moderately
C. Extremely
D. Very extremely - 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 - 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 - 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 - Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?
A. Grinding
B. Machining
C. Cutting
D. Polishing
