

GATE Exam Questions - Engineering
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 :A
196 mg/l
B 200 m/l
C
204 mg/l
D
208 mg/l
ANS: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. |


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