Sewage Treatment Plant objective questions and answers


26. Sewage treatment in an oxidation pond is accomplished primarily by


   A.Algal-bacterial symbosis

   B.Carbon monoxide

   C.Nuclear radiation

   D.Carbon dioxide


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A. Algal-bacterial symbosis

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27. Sewage contains a major percentage of water and only .................... of solids


   A.10%

   B.1%

   C.0.1%

   D.0.01%


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C. 0.1%

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28. Primry treatment of sewage consists of removal of


   A.Large suspended organic solids

   B.Oil and grease

   C.Sand and girt

   D.Floating materials


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A. Large suspended organic solids

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29. The average temperature of sewage in india, is


   A.100 C

   B.150 C

   C.200 C

   D.250 C


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C 200 C

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30. The spacing of bars of perforation of fine screend used for the traetmentof sewage, is


   A.2 to 3 mm

   B.3 to 5 mm

   C.5 to 8 mm

   D.8 to 10 mm


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A. 2 to 3 mm

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