EXAMIANS
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).
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Workers working in __________ industry are most prone to white lung cancer.
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Which of the following is not a source of ozone emission in the atmosphere?
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Smog is not formed due to the presence of __________ in the atmosphere.
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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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Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
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Iron & manganese present as pollutant in water can not be removed by
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Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?
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Infective bacteria in water is killed by the __________ process.
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__________ substances present in sewage are removed in grit chamber during sewage treatment.
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