A. 22
B. 42
C. 332
D. 1050
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 - TLV of aldrin in public water supply system is about ____________ μg/litre?
A. 0.5
B. 17
C. 357
D. 1097 - 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 - 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 - 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 - 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 - Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?
A. Highly
B. Moderately
C. Extremely
D. Very extremely - Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by_______________?
A. Chlorination
B. Treating in biological oxygen pond
C. Chemical coagulation
D. None of these - TLV of lead for public sewer/waste water is about ______________ ppm?
A. 1
B. 25
C. 150
D. 650 - Out of the following, TLV of _______________ is maximum (about 500 ppm)?
A. Carbon dioxide
B. Toluene
C. Carbon disulphide
D. Acetaldehyde
