If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be__________________?

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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...

In water treatment, rapid gravity filters are adopted to remove_______________?

A. dissolved organic substances B. dissolved solids and dissolved gases C. floating solids and dissolved inorganic solids D. bacteria and colloidal solids...

Sewage treatment units are normally designed for______________?

A. 5-10 years B. 15-20 years C. 30-40 years D. 40-50 years...

The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?

A. TOD>BOD>COD B. TOD>COD>BOD C. BOD>COD>TOD D. COD>BOD>TOD...

The overflow rate for plain sedimentation tanks is about__________________?

A. 500 to 750 litres/hour/ m2 B. 1000 to 1250 litres/hour/ m2 C. 1250 to 1500 litres/hour/m2 D. 1500 to 2000 litres/hour/m2...