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Biochemical Oxygen Demand (BOD) in a river water

Increases when sewage gets mixed with river water
Remains unchanged when algal bloom occurs
Has no relationship with concentration of oxygen in the water
Gives a measure of salmonella in the water
Additional Questions

Montreal Protocol aims at

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dB is a standard abbreviation used for the quantitative expression of

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Shell of egg in bird becomes thin (not properly formed) due to the pollution of pesticides. This is due to interference in the activity of :

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Which one of the following pairs of gases are the major causes of "Greenhouse Effect"?

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BOD is connected with

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According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?

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Which one of the following is a wrong statement?

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Phosphate pollution is brought about by

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Sound becomes a hazardous noise pollution if its level is above

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Among the following, a secondary pollutant is

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