EXAMIANS
The resistance of water to the passage of light through it is a measure of the
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Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).
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Nitrogen oxides (NOx) is not produced in the __________ industry.
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Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
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Hydrogen ion concentration in distilled water is
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The main type of sludge gas evolved during sewage treatment in Imhoff tank is
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In water treatment plant, zeolite process is used to remove the __________ of water.
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TLV of mercury in potable (drinking) water is about __________ ppm.
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World's worst radioactive pollution was caused by nuclear reactor disaster which occured in
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Presence of nitrates in water in excess of 50 ppm causes
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