Chemical Engineering MCQs

Page No. 68

______________ cannot control the noise pollution ?


a Use of silencers


bGreen house gases


cVibration damping


d Tree plantation


View Answer Green house gases

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


aHydrocarbons


bHydrogen fluoride


cHydrogen sulphides


d Nitrogen dioxide


View Answer Hydrogen fluoride

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


a20


b100


c400


d 200


View Answer 400

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


a90


b120


c150


d180


View Answer 120

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


aStratosphere


b Thermosphere


cTroposphere


dMesosphere


View Answer Troposphere

____________ is removed from water by lime-soda process?


aFoul smell and taste


bIron and manganese


c Temporary hardness


d Permanent hardness


View Answer Temporary hardness

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


aThermosphere


bStratosphere


cTroposphere


dMesosphere


View Answer Stratosphere

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


aPhotochemical smog


b Peroxyacetyl nitrate (PAN) or methyl nitrite


cBenzopyrene


dPolyacrylonitrile



Dissolved oxygen content in river water is around _____________ ppm?


a5


b 100


c250


d500


View Answer 5

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


a50


b1000


c2000


d5000


View Answer 5000

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