Chemical Engineering MCQs

Page No. 58

Noise level inside a jet airliner in normal flight is about ______________ decibels?


a80


b100


c125


d150


View Answer 100

A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it?


aHydrogen


bCarbon dioxide


c Ozone


dNone of these


View Answer Ozone

Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?


aMercury


bLead


cFluoride


dArsenic


View Answer Fluoride

Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?


aActs as a green house gas thereby raising earth’s temperature


bCauses asphyxia


cCauses increase in sea level


d Enhances the green house effect


View Answer Causes asphyxia

Soluble silica present in boiler feed water can be removed by______________________?


a Coagulation


bFiltration


cAnion exchanger


dPreheating it


View Answer Anion exchanger

Maximum permissible limit of mercury in human blood is ______________ micrograms/100 c.c?


a1


b7


c 19


d82


View Answer 7

Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ?


aHydrogen


bAcetylene


cCarbon monoxide


d Ammonia


View Answer Acetylene

Brown spots in fabrics will be caused by washing with water containing large amount of___________________?


aIron


bZinc


cIodine


dBromine


View Answer Iron

Inorganic impurities causing water pollution is ____________________?


aFats


b Carbohydrates


cSalts of metals


d Protein


View Answer Salts of metals

Ringelmann chart is used for the evaluation of _____________ pollution?


aAir


bWater


cNoise


d Radioactive


View Answer Air

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