EXAMIANS
Which of the following is a manmade source of air pollution?
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A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
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There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
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Removal of __________ is accomplished by aeration of water.
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As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m³.(μg-microgram)
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Presence of nitrates in water in excess of 50 ppm causes
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Deaeration of high pressure boiler feed water is done to reduce
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In water treatment, alum[Al2(SO₄)3] is used for the process of
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Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is
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Main pollutants released from petroleum refineries is
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