Chemical Engineering MCQs

6108 MCQs (Page 520 of 611)

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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

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Fresh sewage is ______________ in nature?

A. Acidic
B. Neutral
C. Alkaline
D. Highly acidic

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______________ is the process of killing organism in water ?

A. Coagulation
B. Sterilisation
C. Disinfection
D. Sedimentation

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Salt content in sea water is about ______________ percent?

A. 0.5
B. 1
C. 3.5
D. 9.05

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High noise levels produced during operation of fans and compressors can be reduced by using__________________?

A. Mufflers (silencers)
B. Acoustic absorbent
C. Lagging of nosiy duct
D. None of these

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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

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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

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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.

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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

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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.

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