Chemical Engineering MCQs

Page No. 45

Ringelmann chart No. 2 corresponds to _______________ percent black smoke?


a10

✖


b20

✖


c40

✓


d80

✖


View Answer 40

Global warming may result in __________________?


aFlood

✖


bCyclone

✖


cDecrease in food productivity

✖


dAll A., B. and C.

✓


View Answer 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_________________?


aOzone and iodine

✖


b Chlorine or its compounds

✖


cUltraviolet light for irradiation of water

✖


dAll A., B. & C.

✓


View Answer All A., B. & C.

Which of the following is not a practical method of low level radioactive waste disposal ?


aDilution with inert material

✖


bDischarging to atmosphere through tall stacks after dilution

✖


cDisposing 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 ________________?


aCatalytic conversion

✖


bGreen house effect

✖


cGlobal warming

✖


dBoth B. and C.

✓


View Answer Both B. and C.

Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?


aActive carbon

✖


b Silica gel

✓


cBog iron (iron oxide)

✖


dPulverised limestone

✖


View Answer Silica gel

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 ?


aCO2

✖


bH2

✖


cSO3

✓


dN2

✖


View Answer SO3

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


a Mufflers (silencers)

✓


bAcoustic absorbent

✖


cLagging of noisy duct

✖


dNone of these

✖



Pick out the wrong statement?


aAll the nitrogenous fertilisers are not soluble in water

✓


bA straight fertiliser contains only one nutrient

✖


cCalcium cyanamide is used as weed killer in onion fields

✖


dThe phosphorous nutrient makes the plant stem stronger and increases its branches

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Removal of ______________ results from the disinfection of water?


aTurbidity

✖


bOdour

✖


cHardness

✖


dBacteria

✓


View Answer Bacteria

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