chemical engineering chemical environmental engineering chemical engineering Mcqs
157. Inhalation of silica dust causes a disease called__________________?
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A. None of these

B. Bronchitis

C. Pneumoconiosis

D. Silicosis
161. Radioactive substances present in the polluted water stream can be removed by_________________?
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A. Coagulation and filtration

B. Biological oxygen treatment

C. Adsorption in ion exchange materials

D. None of these

163. Fresh sewage is ______________ in nature?
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A. Acidic

B. Alkaline

C. Neutral

D. Highly acidic

164. What are the methods of treatment & disposal of radioactive wastes ?
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A. Evaporation & chemical precipitation

B. Fixing into a solid mass with cement and sinking deep in the sea

C. All A., B. & C.

D. Biological methods & adsorption in ion exchange materials

170. Pick out the wrong statement pertaining to green house for the plants ?
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A. Green house is colder than the outside atmosphere

B. acts like the glass of green house thereby warming up the earths surface

C. e ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants

D. The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed

E. Green house effect in earths atmosphere is due to increasing CO2 level in atmosphere, where

F. ide it

171. Foul odour and bad taste of water is removed by treating with__________________?
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A. Activated carbon

B. Copper sulphate

C. Bleaching powder

D. Alum

176. Presence of high concentration of ozone and smog in atmospheric air causes the __________________?
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A. Fading of dye on textiles

B. Cracking of rubber products

C. Embrittlement & decrease of folding resistance of paper

D. Damage of electrical insulator on high tension power line

178. Fine grit present in sewage is removed in the _____________ during sewage treatment?
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A. Detritus tank

B. Trickling filter

C. Grit chamber

D. Skimming tank

179. Scale formation in boiler is controlled by____________________?
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A. Preheating of feed water

B. Reduction in hardness, silica & alumina in feed water

C. Keeping the pH value of feed water just below 7

D. Eliminating H2S in feed water

180. Which is the most widely used coagulant for the treatment of turbid water ?
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A. Alum (aluminium sulphate)

B. Sodium aluminate

C. Ferric chloride

D. Lime

181. Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?
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A. Dust catcher (gravity type)

B. Cyclone separator

C. Bag filter

D. Hollow wet scrubber

185. Which of the following is a secondary air pollutant ?
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A. Dust particles

B. Nitrogen dioxide

C. Sulphur dioxide

D. Photochemical smog
190. ______________ is the process of killing organism in water ?
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A. Sterilisation

B. Sedimentation

C. Disinfection

D. Coagulation

192. Which of the following is a green house gas other than CO2 ?
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A. Nitrous oxide

B. Chlorofluoro carbons (CFC)

C. Methane

D. All A., B. and C.
193. The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?
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A. May increase or decrease; depends on the chemical characteristics of polluted water

B. Remain constant

C. Decreases

D. Increases

194. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?
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A. Cavitation

B. Pipe vibrations

C. Fluctuation in liquid flow

D. Boundary layer separation

195. Which of the following sources is responsible for maximum air pollution ?
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A. Photochemical oxidation of organic matter

B. Industrial chimney exhaust

C. Forest fire

D. Automobiles exhaust
196. Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?
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A. Reduction in plants productivity owing to acid rain

B. All A., B. and C.

C. Respiratory & lung disease

D. Corrosion of building materials

197. Inhalation of silica dust by human being causes ___________________?
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A. Asphyxiation

B. Shortness of breath

C. Tuberculosis

D. Both B. & C.
198. Which of the following is an adsorbent used for the removal of SO2 from gas/air ?
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A. Active carbon

B. Limestone powder or alkalised alumina

C. Silica gel

D. Bog iron

199. Soluble silica present in boiler feed water can be removed by______________________?
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A. Filtration

B. Anion exchanger

C. Preheating it

D. Coagulation