chemical engineering chemical environmental engineering chemical engineering MCQs – Page 11

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 Review each marked answer and report any item that may be outdated or unclear.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
201. Noise pollution level in a chemical plant is expressed in __________________?
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A. Hertz

B. Decibel

C. None of these

D. Roentgen

202. Particles having diameter greater than 75 ?m (micrometer = 10-6 mm) are called__________________?
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A. Powder

B. Dust

C. Smoke

D. Grit
203. Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundries causes___________________?
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A. Shortness of breath

B. All A., B. and C.

C. Asphyxiation (suffocation)

D. Tuberculosis

204. Nitrogen oxides (NOx) is not produced in the ______________ industry?
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A. Detergent

B. Nitric acid making

C. Nitrogenous fertiliser

D. Any of these

205. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
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A. 5

B. 500

C. 50

D. 5000

206. ______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ?
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A. Calcium

B. Phosphorous

C. Fluorine

D. Sulphur

207. The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about ____________ decibels?
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A. 105

B. 90

C. 120

D. 60

208. Which of the following is not a secondary air pollutant ?
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A. All A., B. & C.

B. Photochemical smog

C. Ozone

D. Sulphur dioxide
209. The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________?
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A. Catalytic conversion

B. Green house effect

C. Global warming

D. Both B. and C.
210. White smoke coming out of the chimney of a furnace indicates the use of_________________?
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A. Low excess air

B. Very high excess air

C. Liquid fuel in the furnace

D. Gaseous fuel in the furnace

211. Which of the following radioactive wastes emits all ?, ? & ? rays and hence is the most hazardous of all radioactive emitters ?
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A. Ra-226

B. Au-198

C. I-131

D. Sr-90

212. The maximum CO2 is emitted into the atmosphere by_________________?
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A. Urea

B. Biomass burning

C. Combustion

D. Trees

213. Photochemical smog is formed from automobile exhaust ________________?
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A. By reaction of hydrocarbon & nitric oxide in presence of sunlight

B. Appears only on sunny days

C. Is harmful for crops and trees also besides causing eye irritation & asthma

D. All A., B. & C.
214. Which of the following pollutants, if present in atmosphere is detectable by its odour ?
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A. CO2

B. SO2

C. CO

D. NO2

215. A body which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the________________?
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A. Atmospheric effect

B. Ionosphere

C. Green house

D. Global warming

216. Global warming may result in __________________?
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A. Cyclone

B. All A., B. and C.

C. Flood

D. Decrease in food productivity

217. Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
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A. Biological oxygen pond

B. Lagoons

C. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)

D. Filtration

218. Salt content in sea water is about ______________ percent?
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A. 0.5

B. 9.05

C. 1

D. 3.5
219. Foaming and priming in boiler operation can be reduced by reduction in ______________ in feed water?
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A. Turbidity

B. Total solids

C. All A., B. & C.

D. Color (Hazen)

220. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes____________________?
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A. Cancer

B. Reduced crop yield

C. Respiratory disease (e.g., asthma)

D. Silicosis