Pick up the incorrect statement from the following for allowing workers to enter

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Question
Pick up the incorrect statement from the following for allowing workers to enter sewers
Options
A. The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes
B. Proper tests for the presence of poisonous gases must be carried out
C. The men entering the manhole should be advised to smoke in the sewer
D. Warning signals should be erected
E. None of these.

Correct Answer

The men entering the manhole should be advised to smoke in the sewer

Waste Water Engineering problems

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2. If a 2% solution of sewage sample is incubated for 5 days at 20�C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is
Options
A. 100 mg/l
B. 200 mg/l
C. 300 mg/l
D. 400 mg/l.

6. In a grit chamber of a sewage treatment plant,
Options
A. flow velocity 0.15 m to 0.3 m/sec is kept
B. depth of 0.9 m to 1.20 m is kept
C. one minute of detention period is kept
D. all the above.

8. For detecting the nitrates in sewage, the colour may be developed by adding
Options
A. Pottassium permanganate
B. Sulphuric acid and napthamine
C. Phenol-di-sulphuric acid and pottassium hydroxide
D. None of these.

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