A) Waste decomposed in 5 days
B) Oxygen used in 5 days
C) Microorganisms killed in 5 days
D) Dissolved oxygen left after 5 days
Correct Answer: B
Solution :
[b] Oxygen used in 5 days Bioxygen chemical demand (BOD) ? total amount of oxygen consume by microorganisms in decomposing the waste present in certain volume of a sample of water. Usually to determine BOD, sample of water is saturated with oxygen and incubated for 5 days at \[20{}^\circ \,C\]to get the BOD and is reported in ppm. Water which has BOD less than 5 ppm is considered as pure water where as highly populated water has \[BO{{D}_{5}}\]value greater than 17 ppm.
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