chemical engineering chemical environmental engineering chemical engineering MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.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