In a BOD test, 5 ml of waste is added to 295 ml of aerated pure water. Initial dissolved oxygen (D.O) content of the diluted sample is 7.8 mg/l. After 5 days of incubation at 20°C, the D.O. content of the sample is reduced to 4.4 mg/l. The BOD of the waste water is :-A-196 mg/lB-200 m/lC-204 mg/lD-208 mg/l-B-200 m/l

Question

In a BOD test, 5 ml of waste is added to 295 ml of aerated pure water. Initial dissolved oxygen (D.O) content of the diluted sample is 7.8 mg/l. After 5 days of incubation at 20&deg;C, the D.O. content of the sample is reduced to 4.4 mg/l. The BOD of the waste water is :-A-196 mg/lB-200 m/lC-204 mg/lD-208 mg/l-B-200 m/l

APTITUDE CRACK · Accepted Answer

The correct option is  B 200 m/l The volume of dilution sample over the undiluted raw sample is a formula not aerated water over an undiluted raw sample. 204 is the right answer.

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Q1: In a BOD test, 5 ml of waste is added to 295 ml of aerated pure water. Initial dissolved oxygen (D.O) content of the diluted sample is 7.8 mg/l. After 5 days of incubation at 20°C, the D.O. content of the sample is reduced to 4.4 mg/l. The BOD of the waste water is :

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GATE Exam Questions

Q1: In a BOD test, 5 ml of waste is added to 295 ml of aerated pure water. Initial dissolved oxygen (D.O) content of the diluted sample is 7.8 mg/l. After 5 days of incubation at 20°C, the D.O. content of the sample is reduced to 4.4 mg/l. The BOD of the waste water is :

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