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

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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

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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

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View Answer Air

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