Chemical Engineering MCQs

Page No. 61

Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes_______________?


a Foaming


b Odour nuisances


cUndesirable plant growth


d Turbidity



Which of the following is a secondary air pollutant ?


a Photochemical smog


bSulphur dioxide


c Nitrogen dioxide


dDust particles


View Answer Photochemical smog

Ozone is__________________?


aA primary pollutant


bA secondary pollutant


cImpervious to ultra-violet rays


dBoth B. and C.


View Answer Both B. and C.

Infective bacteria in water is killed by the _____________ process?


aSterilisation


bAeration


cDisinfection


dNone of these


View Answer Sterilisation

Hydrogen ion concentration in distilled water is___________________?


a10-7


b7 × 10-7


c107


d 7 × 107


View Answer 10-7

The progressive warming up of the earth’s surface is mainly due to the___________________?


a Automobile exhaust


bBlanketing effect of CO2 in the atmosphere


cDe-forestation


dThickening of ozone layer



The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?


a Ionosphere


bTroposphere


cStratosphere


dNone of these


View Answer Troposphere

TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes_________________?


aSkin disorder


bBronchitis


cBone disease


dCancer


View Answer Bronchitis

Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by_________________?


aQuenching of hot coke


bDischarging in the river stream


cFiltration and recycling for cooling coke oven gas


d None of these


View Answer Quenching of hot coke

Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?


aParalysis of muscles & loss of appetite


bNervous depression


cGastritis and diarrhea


d All A., B. and C.


View Answer All A., B. and C.

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