1) ______________ is the process of killing organism in water ? a. Coagulation b. Sterilisation c. Disinfection d. Sedimentation
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2) Salt content in sea water is about ______________ percent? a. 0.5 b. 1 c. 3.5 d. 9.05
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3) High noise levels produced during operation of fans and compressors can be reduced by using__________________? a. Mufflers (silencers) b. Acoustic absorbent c. Lagging of noisy duct d. None of these
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4) Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ? a. CO2 b. H2 c. SO3 d. N2
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5) Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ? a. Active carbon b. Silica gel c. Bog iron (iron oxide) d. Pulverised limestone
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6) The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________? a. Catalytic conversion b. Green house effect c. Global warming d. Both B. and C.
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7) Which of the following is not a practical method of low level radioactive waste disposal ? a. Dilution with inert material b. Discharging to atmosphere through tall stacks after dilution c. Disposing off in rivers & oceans d. Filling in steel crates and shooting it off out of earth’s gravity
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8) Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________? a. Ozone and iodine b. Chlorine or its compounds c. Ultraviolet light for irradiation of water d. All A., B. & C.
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9) Global warming may result in __________________? a. Flood b. Cyclone c. Decrease in food productivity d. All A., B. and C.
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10) Ringelmann chart No. 2 corresponds to _______________ percent black smoke? a. 10 b. 20 c. 40 d. 80
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11) Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________? a. Chemical coagulation b. Floatation & skimming c. Centrifugation d. Ultra filtration
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12) ______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ? a. Calcium b. Fluorine c. Phosphorous d. Sulphur
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13) The weakest sound that can be heard by a person in a quiet environment is equivalent to ____________ decibel ? a. 1 b. 5 c. 10 d. 50
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14) Workers working in _______________ industry are most prone to white lung cancer? a. Coal mining b. Limestone mining c. Textile d. Asbestos
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15) Which of the following is a manmade source of air pollution ? a. Automobile exhaust b. Forest fire c. Bacterial action in soil and swamp areas d. All A., B. and C.
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16) Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ? a. Thermosphere b. Troposphere c. Stratosphere d. None of these
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17) 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________________? a. CO2 b. SO2 c. Hydrocarbons d. CFC (chloro fluoro carbon)
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18) The function of skimming tank in sewage treatment is to remove _____________ substances? a. Dissolved solid b. Suspended solid c. Oil & fatty d. Gritty & inorganic
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19) A standard test for determination of hardness in water is termed as ______________ test? a. EDTA b. Electometric c. Total count d. Presumptive
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20) Removal of ______________ results from the disinfection of water? a. Turbidity b. Odour c. Hardness d. Bacteria
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