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1) Which of the following is a secondary air pollutant ? a. Photochemical smog b. Sulphur dioxide c. Nitrogen dioxide d. Dust particles
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2) Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes_______________? a. Foaming b. Odour nuisances c. Undesirable plant growth d. Turbidity
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3) TLV of lead for public sewer/waste water is about ______________ ppm? a. 1 b. 25 c. 150 d. 650
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4) Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels? a. 3 b. 30 c. 7 d. 70
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5) Lagoons used for purification of polluted water_______________? a. Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds b. Use micro-organisms/bacteria in presence of dissolved oxygen c. Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre d. All A., B. & C.
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6) 5-200 μm size particles are called__________________? a. Colloids or aerosols b. Powder c. Dust d. Smoke
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7) A man exposed to excessive noise level in the working environment may suffer from____________________? a. Hearing loss b. Rupture of ear drum c. Nervousness & fatigue d. All A., B. & C.
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8) Which is the most widely used coagulant for the treatment of turbid water ? a. Alum (aluminium sulphate) b. Lime c. Ferric chloride d. Sodium aluminate
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9) Higher concentration of nitrogen dioxide in atmospheric air causes___________________? a. Cancer b. Bronchitis c. Asphyxiation d. Corrosion
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10) Exposure to SO2 containing chimney gases results in the__________________? a. Reduction in strength of leather & cloth b. Acceleration of corrosion rates of metals c. Increased drying & hardening time of paints d. All A., B. and C.
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11) In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks? a. 1 to 2 b. 4 to 5 c. 9 to 10 d. 15 to 20
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12) Insufficient washing of sand grains in a rapid sand filter causes__________________? a. Air binding b. Shrinkage of filtering media c. Mud balls d. Expansion of filtering media
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13) 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_________________? a. Paralysis of muscles & loss of appetite b. Nervous depression c. Gastritis and diarrhea d. All A., B. and C.
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14) Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by_________________? a. Quenching of hot coke b. Discharging in the river stream c. Filtration and recycling for cooling coke oven gas d. None of these
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15) During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank? a. Filtration b. Digestion c. Sedimentation d. Both B. and C.
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16) Which of the following pollutants is absent in the emissions from a fertiliser plant ? a. SO2 & SO3 b. NO2 c. NH3 d. CO
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17) The biological decomposition of organic substances in wastes controlled conditions is called_________________? a. Incineration b. Biological oxidation c. Composting d. None of these
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18) Which of the following sources is responsible for maximum air pollution ? a. Industrial chimney exhaust b. Forest fire c. Automobiles exhaust d. Photochemical oxidation of organic matter
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19) Water filtration rate in a rapid sand filter ranges from ______________ kilolitres/m2/hr? a. 0.1 to 1 b. 3 to 6 c. 10 to 15 d. 15 to 20
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20) Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the_______________? a. Forestation b. Rain c. Green house effect d. Vegetation
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