chemical engineering chemical environmental engineering chemical engineering MCQs – Page 14

Practise multiple-choice questions from chemical engineering chemical environmental engineering chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical environmental engineering chemical engineering Mcqs

261. Which of the following acts as a natural source of air pollution ?
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A. Deforestation

B. Volcanic eruption

C. Forest fire

D. None of these

262. Presence of ____________ in water stream are deleterious to aquatic life?
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A. Soluble and toxic organics

B. Suspended solids

C. Heavy metals and cyanides

D. All A., B. & C.

263. Ionisation potential employed in the industrial electrostatic precipitator is of the order of_______________?
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A. 230 V AC

B. 30 to 70 kV AC

C. 30 to 70 kV DC

D. 230 V DC

264. Pick out the wrong statement?
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A. Benzopyrene which causes cancer is present in traces in tobacco, charcoal & petrol driven

B. omobile exhaust

C. NO2 is capable of penetrating the troposphere and can absorb both ultraviolet & visible light

D. Hydrocarbon pollutants are produced by sweet gum, oak & natural rubber trees

E. H2S is not at all produced during combustion of sulphur bearing fuels as all the sulphur is

F. dised to SO2</strong>

265. Pick out the wrong statement?
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A. Sulphur dioxide is the main pollutant emitted from the exhaust of petrol driven automobiles

B. Decomposition of plants containing chlorophyll is a natural source of carbon monoxide in

C. osphere

D. Catalytic converter is fitted in automobiles to reduce carbon monoxide concentration in

E. aust emissions

F. Inhalation of pollutant carbon monoxide results in death by asphyxiation

266. Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases?
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A. Increase the dew point of

B. Catalytically convert SO2 to SO3 in

C. None of these

D. Reduce SO2 content in

267. Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as________________?
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A. Benzopyrene

B. Peroxyacetyl nitrate (PAN) or methyl nitrite

C. Photochemical smog

D. Polyacrylonitrile

268. Tolerable limit of nitrogen oxides in air is _____________ ppm?
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A. 0.1

B. 1

C. 25

D. 5

269. Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?
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A. Iron & steel plant

B. Petroleum refinery

C. Food industry

D. Municipal sewage treatment

270. Septic tanks are used for the ______________ of the deposited solids?
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A. Separation

B. Aerobic decomposition

C. Anaerobic decomposition

D. None of these

271. Turbidity of water is an indication of the presence of__________________?
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A. Suspended inorganic matter

B. Dissolved solids

C. Floating solids

D. Dissolved gases

272. Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?
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A. 20

B. 200

C. 100

D. 400

273. TLV of aldrin in public water supply system is about ____________ ?g/litre?
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A. 17

B. 0.5

C. 1097

D. 357

274. Industrial workers working in leather tanning & manufacturing units are prone to suffer from ___________________?
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A. Skin diseases (e.g. dermatitis)

B. Respiratory ailments (e.g. bronchitis)

C. Silicosis

D. Blurred vision

275. Pick out the wrong statement ?
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A. Environmental pollution by NOx emission is much higher by four stroke petrol engines as

B. iation to come in but does not allow the short wavelength infra red radiation to escape out

C. The characteristic of a green house body is that it allows the long wavelength incoming solar

D. Temperature in stratosphere rises with increasing altitude

E. mical oxygen demand (C.O.D.) value

F. pared to the two stroke engines

276. BOD of raw municipal sewage may be in the range of about _____________ mg/litre?
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A. 2-Jan

B. 150-300

C. 2000-3000

D. 10-May

277. Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes________________?
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A. Reduced strength of textiles

B. All A., B. and C.

C. Fading of dyes on textiles

D. Corrosion, tarnishing & soiling of metals

278. Pick out the correct statement?
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A. All A., B. & C.

B. Noise from vibrating chutes can be reduced by lining the metallic chute with rubber

C. Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and

D. Noise from ball mills can be dealt with by fibre glass lined enclosures

E. ber/plastic covered metallic rollers

279. Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes________________?
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A. Nervous system disorder

B. All A., B. and C.

C. Blood poisoning

D. Anaemia

280. Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels?
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A. 145

B. 105

C. 125

D. 85

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