chemical engineering chemical environmental engineering chemical engineering MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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

221. Main pollutant present in automobile exhaust is_________________?
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A. CO2

B. NO

C. Hydrocarbons

D. CO
222. Maximum permissible turbidity in potable water is _____________ ppm?
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A. 1

B. 250

C. 1000

D. 10
223. Water filtration rate in a rapid sand filter ranges from ______________ kilolitres/m2/hr?
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A. 15 to 20

B. 3 to 6

C. 0.1 to 1

D. 10 to 15

224. TLV of lead for public sewer/waste water is about ______________ ppm?
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A. 1

B. 25

C. 650

D. 150

225. Which of the following is the most major constituents of air pollutants ?
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A. Hydrogen sulphide

B. Oxides of nitrogen

C. Oxides of sulphur

D. Carbon monoxide

226. Pick out the wrong statement ?
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A. atosphere</strong>

B. ne

C. Mesosphere is characterised by very low atmospheric pressure and low temperature

D. The radio waves used in the long distance radio communication are reflected back to earth by

E. Troposphere is a dusty zone containing water vapor and clouds

F. The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in

227. Dissolved oxygen content in river water is around _____________ ppm?
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A. 100

B. 250

C. 500

D. 5
228. Thermal pollution due to excessive heat & temperature in the working place causes__________________?
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A. Reduction in working efficiency of manpower

B. All A., B. & C.

C. Fatigue

D. High breathing rate

229. Iron & manganese present in the polluted water is removed by __________________?
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A. Oxidation followed by settling & filtration

B. Chemical coagulation

C. Chlorination only

D. Simple filtration

230. Pick out the wrong statement?
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A. A bag filter incurs very small pressure drop and is very efficient for removal of submicronic

B. None of these

C. t particles from flue gases at very high temperature</strong>

D. A slight haze at the top of chimney indicates good combustion in the furnace

E. micronic dust particles present in flue gas

F. Electrostatic precipitator is the most efficient dust collection equipment for removal of

231. Noise level during normal conversation among men is about ______________ decibels?
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A. 115

B. 10

C. 45

D. 90

232. Pick out the one which is not a chemical coagulant ?
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A. Aluminium sulphate

B. Chloramine

C. Hydrated lime

D. Ferrous sulphate

233. Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by_______________?
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A. None of these

B. Chemical coagulation

C. Chlorination

D. Treating in biological oxygen pond
234. Tri-sodium phosphate is used in boiler water treatment to reduce____________________?
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A. Caustic embrittlement

B. Dissolved oxygen

C. Suspended silica

D. Turbidity

235. Presence of excess fluorine in water causes__________________?
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A. Tooth decay

B. Fluorosis

C. Dental cavity

D. Respiratory disease

236. Particulate air pollutants are finely divided solids and liquids. Which of the following is not a particulate? ?
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A. None of these

B. Dust & mists

C. Photochemical smog & soot

D. Smoke & fumes

237. Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?
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A. Hydrocarbons

B. Nitrogen dioxide

C. Hydrogen fluoride

D. Hydrogen sulphides

238. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?
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A. Biological oxygen pond

B. Trickling filters

C. Aerated lagoons

D. Gravity separator having oil skimming devices
239. Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called________________?
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A. Stratosphere

B. Thermosphere

C. Troposphere

D. Mesosphere

240. The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?
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A. Parasitic

B. Aerobic

C. Anaerobic

D. Saprophytic

241. The main industrial source of emission of hydrogen sulphide air pollutant is________________?
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A. Pulp and paper plant

B. Coal based thermal power plants

C. Metallurgical roasting & smelting plant

D. Petroleum refineries

242. Which of the following is the most detrimental for water used in high pressure boiler ?
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A. Silica

B. Turbidity

C. Dissolved oxygen

D. Phenol

243. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?
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A. 120

B. 180

C. 150

D. 90

244. Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings?
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A. Hydrogen sulphide

B. Asbestos

C. Mercury

D. Cadmium
245. Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?
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A. Iron & manganese

B. Bi-carbonates

C. Carbonates

D. Arsenic

246. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?
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A. Inorganic

B. None of these

C. Organic

D. Radioactive

247. Most of the atmospheric air pollutants are present in large quantity in__________________?
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A. Stratosphere

B. Thermosphere

C. Mesosphere

D. Troposphere
248. Pick out the correct statement ?
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A. Deforestation helps in controlling the green house effect

B. Lightening discharges are natural source of production of SO2 & H2S pollutant

C. lone</strong>

D. Sulphur dioxide causes death by asphyxiation

E. Global warming is detrimental for increase in food productivity and may cause flood and
249. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?
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A. Cruising

B. Acceleration

C. Idle running

D. Deceleration

250. ____________ substances present in sewage are removed in grit chamber during sewage treatment?
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A. Dissolved

B. Organic

C. Fatty

D. Inorganic