EXAMIANS
Lagoons used for purification of polluted water
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There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
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World's worst radioactive pollution was caused by nuclear reactor disaster which occured in
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Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
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Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.
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The upper layer of atmosphere is called the
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Septic tanks are used for the __________ of the deposited solids.
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In a sedimentation tank, the detention period for water ranges from __________ hours.
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Which of the following fine dust removal equipments is the most efficient?
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Which of the following is not a natural source of air pollution?
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