The weakest sound that can be heard by a person in a quiet environment is equivalent to ____________ decibel ?
A. 1
B. 5
C. 10
D. 50
Chemical Environmental Engineering
______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
A. Calcium
B. Fluorine
C. Phosphorous
D. Sulphur
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?
A. Chemical coagulation
B. Floatation & skimming
C. Centrifugation
D. Ultra filtration
Ringelmann chart No. 2 corresponds to _______________ percent black smoke?
Ringelmann chart No. 2 corresponds to _______________ percent black smoke?
A. 10
B. 20
C. 40
D. 80
Global warming may result in __________________?
Global warming may result in __________________?
A. Flood
B. Cyclone
C. Decrease in food productivity
D. All A., B. and C.
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?
A. Ozone and iodine
B. Chlorine or its compounds
C. Ultraviolet light for irradiation of water
D. All A., B. & C.
Which of the following is not a practical method of low level radioactive waste disposal ?
Which of the following is not a practical method of low level radioactive waste disposal ?
A. Dilution with inert material
B. Discharging to atmosphere through tall stacks after dilution
C. Disposing off in rivers & oceans
D. Filling in steel crates and shooting it off out of earth’s gravity
The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________?
The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________?
A. Catalytic conversion
B. Green house effect
C. Global warming
D. Both B. and C.
Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?
Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?
A. Active carbon
B. Silica gel
C. Bog iron (iron oxide)
D. Pulverised limestone
Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?
Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?
A. CO2
B. H2
C. SO3
D. N2