1) Which of the following is an adsorbent used for the removal of SO2 from gas/air ? a. Bog iron b. Limestone powder or alkalised alumina c. Silica gel d. Active carbon
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2) ‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________? a. Industrial chimney exhaust b. Automobiles exhaust c. Photochemical reaction in polluted atmosphere d. Burning of domestic fuel
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3) _____________ plant emits large amount of SO2 as an air pollutant? a. Nitric acid b. Sulphuric acid c. Chlor alkali d. Iron & steel
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4) The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________? a. CO2 b. CH4 c. CO d. H2
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5) Brown spots in fabrics will be caused by washing with water containing large amount of___________________? a. Iron b. Zinc c. Iodine d. Bromine
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6) Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ? a. Hydrogen b. Acetylene c. Carbon monoxide d. Ammonia
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7) Maximum permissible limit of mercury in human blood is ______________ micrograms/100 c.c? a. 1 b. 7 c. 19 d. 82
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8) Soluble silica present in boiler feed water can be removed by______________________? a. Coagulation b. Filtration c. Anion exchanger d. Preheating it
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9) Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ? a. Acts as a green house gas thereby raising earth’s temperature b. Causes asphyxia c. Causes increase in sea level d. Enhances the green house effect
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10) Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water? a. Mercury b. Lead c. Fluoride d. Arsenic
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11) A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of _____________ high above earth’s atmosphere, which absorbs it? a. Hydrogen b. Carbon dioxide c. Ozone d. None of these
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12) Noise level inside a jet airliner in normal flight is about ______________ decibels? a. 80 b. 100 c. 125 d. 150
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13) Aerosols present in atmospheric air may be__________________? a. Positively charged b. Negatively charged c. Neutral d. Combination of all A., B. & C.
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14) Fresh domestic sewage is _______________ in color? a. Grey b. Dark brown c. Red d. Black
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15) Polyvinyl chloride containers are not suitable for storing_________________? a. Foodstuffs b. Woolen clothes c. Metallic powder d. None of these
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16) The resistance of water to the passage of light through it is a measure of the___________________? a. Turbidity b. Color c. Hardness d. Dissolved gases
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17) Carcinogenic air pollutants cause__________________? a. Bone decay b. Cancer c. Asphyxiation (suffocation) d. Anemia
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18) The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ? a. Chlorine b. Alkalis c. Benzene hexachloride d. Alkyl benzene sulphonate (ABS)
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19) The lowest layer of atmosphere is known as the_____________________? a. Stratosphere b. Troposphere c. Ionosphere d. None of these
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20) Inhalation of silica dust by human being causes ___________________? a. Asphyxiation b. Shortness of breath c. Tuberculosis d. Both B. & C.
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