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ENVIRONMENTAL ENGINEERING IN CE QUIZ

A shallow pond in which the sewage is retained and biologically treated is called

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Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

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Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

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The pH value of potable water should be between

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If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is(i) Presumptive coli-form test(ii) Confirmed coli-form test(iii) Completed coli-form test

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Noise level inside a jet air liner in normal flight is about __________ decibels.

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Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

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Which of the following acts as a natural source of air pollution?

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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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Presence of dissolved impurities of __________ is responsible for the red brownish color of water.

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