Chemical Engineering MCQs

Page No. 61

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


a Foaming

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b Odour nuisances

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cUndesirable plant growth

✓


d Turbidity

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Which of the following is a secondary air pollutant ?


a Photochemical smog

✓


bSulphur dioxide

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c Nitrogen dioxide

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dDust particles

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View Answer Photochemical smog

Ozone is__________________?


aA primary pollutant

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bA secondary pollutant

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cImpervious to ultra-violet rays

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dBoth B. and C.

✓


View Answer Both B. and C.

Infective bacteria in water is killed by the _____________ process?


aSterilisation

✓


bAeration

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cDisinfection

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dNone of these

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View Answer Sterilisation

Hydrogen ion concentration in distilled water is___________________?


a10-7

✓


b7 × 10-7

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c107

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d 7 × 107

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View Answer 10-7

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


a Automobile exhaust

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bBlanketing effect of CO2 in the atmosphere

✓


cDe-forestation

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dThickening of ozone layer

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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

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bTroposphere

✓


cStratosphere

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dNone of these

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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

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bBronchitis

✓


cBone disease

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dCancer

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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

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cFiltration and recycling for cooling coke oven gas

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d None of these

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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

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bNervous depression

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cGastritis and diarrhea

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d All A., B. and C.

✓


View Answer All A., B. and C.

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