Sewage Treatment Plant objective questions and answers

31. Raw sludge should be removed from the primary settling tank

   A.Continuously

   B.Atleast twice in a hour

   C.Atleast twice a day

   D.Once in a week

32. An oxygen deficiency or dangerous concentrations of toxic or suffocating gases may be found in

   A.Toilets

   B.Wet wells

   C.Air blower rooms

   D.Offices

33. Waste water from a paper mill may be expected to have

   A.Oil slick

   B.Foam

   C.Suspended solids

   D.Phosphate

34. Which is the most dangerous metal for human health?

   A.Zinc

   B.Iron

   C.Copper

   D.Lead

35. The specific gravity of sand is

   A.1.0

   B.1.15

   C.1.5

   D.2.65

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