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

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Waste Water Engineering
The pressure exerted by

Pressure sewers are designed to be safe in tension
The internal pressure if any, causes tensile stress in the pipe material
All listed here
The sewage when running full from inside, is called internal pressure

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