Which of the following retards the self purification of stream ?

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The type of valve, which is provided on the suction pipe in a tube-well, is____________?

A. air relief valve B. reflux valve C. pressure relief valve D. sluice valve...

Scour valves are provided ______________?

A. at street corners to control the flow of water B. at every depression and dead ends to drain out the waste water that may collect there C. at the foot of rising main along the slope to prevent back running of water D. at every summit of rising mains...

The process of lagooning is primarily a means of________________?

A. reducing the excessive flow in sewers B. disposing of sludge C. increasing the capacity of storage re-servoirs D. increasing flow of sewage through imhoff tanks...

A sewer that receives the discharge of a number of house sewers is called________________?

A. house sewer B. lateral sewer C. intercepting sewer D. submain sewer...

Which of the following values of pH represents a stronger acid?

A. 2 B. 5 C. 7 D. 10...