chemical engineering chemical environmental engineering chemical engineering MCQs – Page 13

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 Review each marked answer and report any item that may be outdated or unclear.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

241. The main industrial source of emission of hydrogen sulphide air pollutant is________________?
0

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 ?
0

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?
0

A. 120

B. 180

C. 150

D. 90

244. Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings?
0

A. Hydrogen sulphide

B. Asbestos

C. Mercury

D. Cadmium

245. Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?
0

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?
0

A. Inorganic

B. None of these

C. Organic

D. Radioactive

247. Most of the atmospheric air pollutants are present in large quantity in__________________?
0

A. Stratosphere

B. Thermosphere

C. Mesosphere

D. Troposphere

248. Pick out the correct statement ?
0

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 ?
0

A. Cruising

B. Acceleration

C. Idle running

D. Deceleration

250. ____________ substances present in sewage are removed in grit chamber during sewage treatment?
0

A. Dissolved

B. Organic

C. Fatty

D. Inorganic

251. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is__________________?
0

A. Inversely proportional to viscosity of gas

B. Proportional to the viscosity & density of the gas

C. Proportional to the pressure of the gas

D. Both B. and C.

252. Particulates (< 1?m size) remaining suspended in air indefinitely and transported by wind currents are called_________________?
0

A. Fumes

B. Aerosols

C. Mists

D. Smoke

253. ______________ cannot control the noise pollution ?
0

A. Vibration damping

B. Tree plantation

C. Use of silencers

D. Green house gases

254. Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?
0

A. Natural aeration of water stream

B. Photosynthetic action of algae

C. Both A. & B.

D. Neither A. nor B.

255. Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?
0

A. 50

B. 5000

C. 2000

D. 1000

256. Presence of _____________ hardness is responsible for the temporary hardness in water?
0

A. Chloride

B. Sulphate

C. Carbonate

D. Calcium

257. Pick out the wrong statement?
0

A. logical decomposition of the organic matter present in water stream present as food for the

B. BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water)

C. BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the

D. ing organism

E. Biological oxygen demand (BOD) is a characteristic and not a constituent of water

F. None of these

258. ____________ is removed from water by lime-soda process?
0

A. Iron and manganese

B. Foul smell and taste

C. Temporary hardness

D. Permanent hardness

259. Pick out the wrong statement ?
0

A. Carbon monoxide present in the two stroke petrol engine exhaust is much less as compared to

B. t emitted by a four stroke engine

C. t emitted from a four stroke engine</strong>

D. Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is

E. ponsible for causing Minamata disease

F. Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more as compared to

260. The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to ______________ percent?
0

A. 12

B. 1

C. 8

D. 4

Previous Next

Showing 241 to 260 of 282 mcqs