Waste Water Engineering
In case of sewer lines

Test for straightness is carried out with the help of a lamp and mirror
All listed here
Obstruction test is carried out with the help of smooth ball of diameter 13 mm
Water test is carried out to check water tightness of the joints

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

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

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