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Civil Engineering :: Waste Water Engineering

  1. The most dangerous pollutant in vehicular emissions is

  2. A.

     CO₂

    B.

     SO₂

    C.

     CO₂

    D.

     O₂


  3. The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

  4. A.

     25 %

    B.

     50 %

    C.

     10 %

    D.

     5 %


  5. The design period in years for pumping plants, is

  6. A.

     1

    B.

     2 to 3

    C.

     3 to 5

    D.

     5 to 10


  7. At the junction of sewers

  8. A.

     Top of smaller sewer is kept lower

    B.

     Top of larger sewer is kept lower

    C.

     Tops of both the sewers are at the same level

    D.

     None of these


  9. The most effective arrangement for diverting excess storm water into a natural drainage, is

  10. A.

     Leaping weir

    B.

     Overflow weir

    C.

     Siphon spill way

    D.

     None of these


  11. Imhoff cone is used to determine

  12. A.

     Settleable solids

    B.

     Suspended solids

    C.

     Dissolved solids

    D.

     None of these


  13. The algae dies out in the zone of

  14. A.

     Degradation

    B.

     Active decomposition

    C.

     Recovery

    D.

     Cleaner water


  15. For detecting the nitrates in sewage, the colour may be developed by adding

  16. A.

     Potassium permanganate

    B.

     Sulphuric acid and napthamine

    C.

     Phenol-di -sulphuric acid and potassium hydroxide

    D.

     None of these


  17. For detecting the nitrites in the sewage, the matching colour may be developed by adding

  18. A.

     Potassium permanganate

    B.

     Sulphuric acid and napthamine

    C.

     Phenol-di -sulphuric acid potassium hydroxide

    D.

     None of these


  19. The average temperature of sewage in India, is

  20. A.

     10°C

    B.

     15°C

    C.

     20°C

    D.

     25°C