Waste Water Engineering
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion

Should be sunk by 20 cm
Need not be sunk
Should be sunk by 50 cm
Should be kept 20 cm above the adjacent portion

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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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