Chemical Engineering MCQs

Page No. 56

Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels?


a120


b 140


c170


d 207


View Answer 170

Presence of bacteria in potable (drinking) water causes_________________?


aTurbidity


bDisease


cBad odour


d Bad taste & colour


View Answer Disease

TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?


a0.1


b25


c100


d 1000


View Answer 0.1

Radioactive substances present in the polluted water stream can be removed by_________________?


a Biological oxygen treatment


b Coagulation and filtration


c Adsorption in ion exchange materials


dNone of these



H2S present in gaseous stream can be removed by adsorption on _____________________?


aSilica gel


bActive carbon


cBog iron


dLimestone powder


View Answer Bog iron

Maximum permissible turbidity in potable water is _____________ ppm?


a1


b10


c 250


d1000


View Answer 10

Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________?


aBlood poisoning


bAnaemia


cNervous system disorder


dAll A., B. & C.


View Answer All A., B. & C.

Higher concentration of CO2 in atmosphere_____________________?


aAllows visible solar radiation (ultraviolet) of short wave-length to pass through


b Reflects and absorbs the longer wavelength (infra-red) radiations


cPrevents solar heat being radiated out completely, resulting in ‘heat trap’ i.e., global warming


d All A., B. and C.


View Answer All A., B. and C.

The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?


a CO2


bCH4


cCO


dH2


View Answer CH4

_____________ plant emits large amount of SO2 as an air pollutant?


aNitric acid


bSulphuric acid


cChlor alkali


d Iron & steel


View Answer Sulphuric acid

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