EXAMIANS
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
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Which of the following industries discharge mercury as a pollutant?
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Inhalation of silica dust by human being causes
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Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
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Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
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Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?
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Carbonaceous particles having size less than 1 μm are called
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In a sedimentation tank, the detention period for water ranges from __________ hours.
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Exposure to chemicals having carcinogenic properties cause
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A man exposed to excessive noise level in the working environment may suffer from
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