TLV of mercury in potable (drinking) water is about ______________ ppm?
TLV of mercury in potable (drinking) water is about ______________ ppm?
A. 0.001
B. 0.1
C. 1
D. 5
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Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?
Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?A. 50
B. 1000
C. 2000
D. 5000Ionisation potential employed in the industrial electrostatic precipitator is of the order of_______________?
Ionisation potential employed in the industrial electrostatic precipitator is of the order of_______________?A. 30 to 70 kV DC
B. 30 to 70 kV AC
C. 230 V AC
D. 230 V DCWhich of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?A. I-131
B. Sr-90
C. Au-198
D. Ra-226Main pollutants released from petroleum refineries is__________________?
Main pollutants released from petroleum refineries is__________________?A. CO, SO2 & H2S
B. CO2, NO & SO3
C. CO2, H2S & NO2
D. SO3, NO2 & CO2Presence of soluble organics in polluted water causes_________________?
Presence of soluble organics in polluted water causes_________________?A. Undesirable plants growth
B. Depletion of oxygen
C. Fire hazards
D. Explosion hazardsMain pollutants released from iron & steel industry is__________________?
Main pollutants released from iron & steel industry is__________________?A. CO, CO2 & SO2
B. H2S, NO & SO3
C. CO2, H2S & NO2
D. SO3, NO2 & CO2