Chemical Engineering MCQs

Page No. 68

______________ cannot control the noise pollution ?


a Use of silencers

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bGreen house gases

✓


cVibration damping

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d Tree plantation

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View Answer Green house gases

Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?


aHydrocarbons

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bHydrogen fluoride

✓


cHydrogen sulphides

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d Nitrogen dioxide

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View Answer Hydrogen fluoride

Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?


a20

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b100

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c400

✓


d 200

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View Answer 400

Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?


a90

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b120

✓


c150

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d180

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View Answer 120

Most of the atmospheric air pollutants are present in large quantity in__________________?


aStratosphere

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b Thermosphere

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cTroposphere

✓


dMesosphere

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View Answer Troposphere

____________ is removed from water by lime-soda process?


aFoul smell and taste

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bIron and manganese

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c Temporary hardness

✓


d Permanent hardness

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View Answer Temporary hardness

Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called________________?


aThermosphere

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bStratosphere

✓


cTroposphere

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dMesosphere

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View Answer Stratosphere

Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as________________?


aPhotochemical smog

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b Peroxyacetyl nitrate (PAN) or methyl nitrite

✓


cBenzopyrene

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dPolyacrylonitrile

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Dissolved oxygen content in river water is around _____________ ppm?


a5

✓


b 100

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c250

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d500

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View Answer 5

Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?


a50

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b1000

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c2000

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d5000

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View Answer 5000

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