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  1. The main disadvantage of oxidation pond is that

  2. A.

     Large area is required for construction

    B.

     Maintenance and operation cost are high

    C.

     BOD removal is very low

    D.

     None of the above


  3. The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

  4. A.

     Equal to HMD when flowing full

    B.

     Less than HMD when flowing full

    C.

     Greater than HMD when flowing full

    D.

     None of the above


  5. Settling velocity increases with

  6. A.

     Specific gravity of solid particles

    B.

     Size of particles

    C.

     Depth of tank

    D.

     Temperature of liquid


  7. Turbidity is measured on

  8. A.

     Standard silica scale

    B.

     Standard cobalt scale

    C.

     Standard platinum scale

    D.

     Platinum cobalt scale


  9. The maximum discharge of a tube well is about

  10. A.

     5 liters/sec

    B.

     50 liters/sec

    C.

     500 liters/sec

    D.

     1000 liters/sec


  11. When there is no recirculation of sewage, then recirculation factor is

  12. A.

     0

    B.

     1

    C.

     Infinity

    D.

     None of the above


  13. On standard silica scale, the turbidity in drinking water should be limited to

  14. A.

     10 ppm

    B.

     20 ppm

    C.

     30 ppm

    D.

     50 ppm


  15. The most commonly used sewer under culverts is

  16. A.

     Circular brick sewer

    B.

     Circular cast iron sewer

    C.

     Semi-elliptical sewer

    D.

     Horseshoe type sewer


  17. Ground water is usually free from

  18. A.

     Suspended impurities

    B.

     Dissolved impurities

    C.

     Both suspended and dissolved impurities

    D.

     None of the above


  19. The layout of distribution system in which water flows towards the outer periphery is

  20. A.

     Ring system

    B.

     Dead end system

    C.

     Radial system

    D.

     Grid iron system