Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

Potassium permanganate
Sulphuric acid and napthamine
Phenol-di -sulphuric acid potassium hydroxide
None of these

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Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

The men entering the manhole should be advised to smoke in the sewer
The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
Proper tests for the presence of poisonous gases must be carried out
Warning signals should be erected

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