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
Answer: Option D
Related Questions on Environmental Engineering in CE
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
A. Mercury
B. Lead
C. Fluoride
D. Arsenic
Smog is not formed due to the presence of __________ in the atmosphere.
A. SO2
B. NOx
C. CO2
D. Any of these
Dose of chlorine for disinfection of water is about __________ mg/litre of water.
A. 0.01
B. 0.1
C. 0.3
D. 1
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