113) Select the correct statement.

5 day BOD is the ultimate BOD.

5 day BOD is greater than 4 day BOD keeping other conditions same.

5 day BOD is less than 4 day BOD keeping other conditions same.

BOD does nof depend on time.

Answer is:

5 day BOD is less than 4 day BOD keeping other conditions same.

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114) If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

100000

1000

4000

400000

Answer is:

400000

115) The rate of BOD exerted at any time is

directly proportional to BOD satisfied

directly proportional to BOD remain-ing ,

inversely proportional to BOD satisfied

inversely proportional to BOD re-maining

Answer is:

directly proportional to BOD remain-ing ,

116) The ratio of 5 day BOD to ultimate BOD is about

1/3

2/3

3/4

Answer is:

2/3

117) In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C.The BOD of raw sewage will be

100 ppm

200 ppm

300 ppm

400 ppm

Answer is:

200 ppm

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113) Select the correct statement.

5 day BOD is less than 4 day BOD keeping other conditions same.

Environmental Engineering MCQ with Answers

Related Environmental Engineering MCQ with Answers

114) If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

400000

115) The rate of BOD exerted at any time is

directly proportional to BOD remain-ing ,

116) The ratio of 5 day BOD to ultimate BOD is about

2/3

117) In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C.The BOD of raw sewage will be

200 ppm

Environmental Engineering MCQ with Answers