Chemical Engineering MCQs

Page No. 43

Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?


aCO

✓


bSO2

✖


cNOx

✖


dCFC (chloro fluoro carbons)

✖


View Answer CO

The term Biological Oxygen Demand (BOD) is used in relation to ______________________?


aPotable water

✖


bCooling water

✖


cDistilled water

✖


d Industrial effluents

✓



The upper layer of atmosphere is called the ____________________?


aStratosphere

✓


bTroposphere

✖


cIonosphere

✖


dNone of these

✖


View Answer Stratosphere

CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?


a102

✖


b105

✓


c109

✖


d1015

✖


View Answer 105

The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?


a20

✖


b230

✓


c750

✖


d1500

✖


View Answer 230

Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?


a105

✖


b135

✓


c135

✖


d185

✖


View Answer 135

Disinfection of water is done to remove ______________________?


aColor

✖


bBad taste

✖


cFoul odour

✖


dBacteria

✓


View Answer Bacteria

In water treatment plant, zeolite process is used to remove the _____________ of water?


aAcidity

✖


b Alkalinity

✖


cHardness

✓


dIron & zinc

✖


View Answer Hardness

Salt content in sea water is about ______________ percent?


a0.5

✖


b1

✖


c 3.5

✓


d9.05

✖


View Answer 3.5

______________ is the process of killing organism in water ?


a Coagulation

✖


bSterilisation

✖


cDisinfection

✓


dSedimentation

✖


View Answer Disinfection

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