chemical engineering chemical environmental engineering chemical engineering MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.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

121. The pH value of potable water should be between____________________?
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A. 1 to 1.5

B. 13 to 14

C. 6.5 to 8

D. 4 to 5

122. Which of the following is not a weightless pollutant ?
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A. SPM

B. Noise pollution

C. Radioactive rays

D. Thermal pollution

123. The widest explosive limit is of _____________, thereby making it the most explosive gas?
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A. Hydrogen

B. Petrol vapor

C. Acetylene

D. Carbon monoxide

124. TLV of mercury in potable (drinking) water is about ______________ ppm?
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A. 5

B. 0.001

C. 1

D. 0.1

125. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?
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A. Ultra filtration

B. Chemical coagulation

C. Centrifugation

D. Floatation & skimming

126. Color test of water is done with an instrument called__________________?
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A. Colorimeter

B. Tintometer

C. Electro-chemical cell

D. Turbidimeter

127. In the context of the chemical process industries, the term BOD is normally associated with the_____________________?
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A. Characterisation of boiler feed water

B. Characterisation of liquid effluents

C. Organic concentration in gaseous effluents

D. Characterisation of solid wastes

128. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?
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A. CFC (chloro fluoro carbon)

B. CO2

C. SO2

D. Hydrocarbons

129. Which is the most practical and economical method for removal of suspended solid matter from polluted water ?
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A. Sedimentation

B. Biological oxidation

C. Skimming off

D. Chlorination

130. Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?
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A. Bog iron (iron oxide)

B. Pulverised limestone

C. Silica gel

D. Active carbon

131. Dust collection efficiency of a cyclone separator depends upon its______________?
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A. Inlet gas velocity

B. Overall height

C. All A., B. & C.

D. Diameter

132. The term Biological Oxygen Demand (BOD) is used in relation to ______________________?
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A. Industrial effluents

B. Cooling water

C. Potable water

D. Distilled water

133. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?
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A. Nervous depression

B. All A., B. and C.

C. Gastritis and diarrhea

D. Paralysis of muscles & loss of appetite

134. Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?
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A. Chemical coagulation

B. Biological oxidation pond

C. Activated carbon adsorption

D. Lagooning

135. The lowest layer of atmosphere is known as the_____________________?
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A. Stratosphere

B. Ionosphere

C. Troposphere

D. None of these

136. Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
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A. In sedimentation tanks equipped with mechanical scrapper

B. In clarifiers

C. In vacuum filter

D. By chemical coagulation

137. Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
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A. Petroleum refinery

B. Sulphuric acid plant

C. Thermal power plant

D. Nitric acid plant

138. Ringelmann chart is used for the evaluation of _____________ pollution?
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A. Water

B. Radioactive

C. Noise

D. Air

139. There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earths surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about _____________ C/km?
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A. 6.5

B. 0.05

C. 1

D. 15

140. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by_________________?
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A. None of these

B. Quenching of hot coke

C. Filtration and recycling for cooling coke oven gas

D. Discharging in the river stream

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