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Civil Set-1
Environmental Engineering
115

Environmental Engineering MCQ with Answers

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 ,

Environmental Engineering MCQ with Answers

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Related Environmental Engineering MCQ with Answers

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

1/3

2/3

3/4

1

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

118) The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is

1 ppm

4 ppm

10 ppm

40 ppm

Answer is:

4 ppm

119) The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is

1

100

infinite

zero

Answer is:

100

Environmental Engineering MCQ with Answers

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