Environmental Engineering - Chemical Engineering Questions and Answers

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Which of the following is not a secondary air pollutant ?

Ozone

Photochemical smog

Sulphur dioxide

All (a), (b) & (c)

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The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.

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The main industrial source of emission of hydrogen sulphide air pollutant is

petroleum refineries.

coal based thermal power plants.

pulp and paper plant.

metallurgical roasting & smelting plant.

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Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

radioactive

organic

inorganic

none of these

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

120

150

180

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Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes

fading of dyes on textiles.

corrosion, tarnishing & soiling of metals.

reduced strength of textiles.

all (a), (b) and (c).

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Nitrogen oxides (NO_x) is not produced in the __________ industry.

nitric acid making

nitrogenous fertiliser

detergent

any of these

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World's worst radioactive pollution was caused by nuclear reactor disaster which occured in

Arizona (U.S.A.)

Chernobyl (undivided U.S.S.R.)

Pensylvania (U.S.A.)

Moscow (U.S.S.R.)

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Dissolved oxygen content in river water is around __________ ppm.

100

250

500