Chemical Engineering MCQs

Page No. 57

‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?


aIndustrial chimney exhaust

✖


bAutomobiles exhaust

✓


cPhotochemical reaction in polluted atmosphere

✖


dBurning of domestic fuel

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View Answer Automobiles exhaust

Which of the following is an adsorbent used for the removal of SO2 from gas/air ?


aBog iron

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b Limestone powder or alkalised alumina

✓


cSilica gel

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dActive carbon

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Radioactive solid nuclear wastes are disposed off by _________________?


aHigh temperature incineration

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b Pathological incineration

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c Pyrolysis

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dUnderground burial in concrete containers

✓



Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?


a84

✓


b88

✖


c80

✖


d92

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View Answer 84

Growth of ______________ is promoted by the presence of manganese in water?


a Files

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bAlgae

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cMicro-organisms

✓


dMosquitoes

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View Answer Micro-organisms

The pH value of oxidised sewage is about_____________________?


a1.8

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b6.2

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c 7.3

✓


d13.4

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View Answer 7.3

Arsenic pollutant is not generated in _______________ industries?


aTanneries

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bGlass & ceramic

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cBeverages

✓


dAny of these

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View Answer Beverages

Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?


aGrinding

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bMachining

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cCutting

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dPolishing

✓


View Answer Polishing

Fresh domestic sewage is _______________ in color?


aGrey

✓


bDark brown

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cRed

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dBlack

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View Answer Grey

Aerosols present in atmospheric air may be__________________?


aPositively charged

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b Negatively charged

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cNeutral

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dCombination of all A., B. & C.

✓



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