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  1. The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is

  2. A.

     9500

    B.

     9800

    C.

     10100

    D.

     10920


  3. The suitable method of forecasting population for a young and rapidly increasing city is

  4. A.

     Arithmetical increase method

    B.

     Geometrical increase method

    C.

     Incremental increase method

    D.

     Graphical method


  5. Average rate of water consumption per head per day as per Indian Standard is

  6. A.

     100 liters

    B.

     135 liters

    C.

     165 liters

    D.

     200 liters


  7. The suitable layout of distribution system for a city with roads of rectangular pattern is

  8. A.

     Grid iron system

    B.

     Dead end system

    C.

     Ring system

    D.

     Radial system


  9. The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called

  10. A.

     Waste pipe

    B.

     Soil pipe

    C.

     Vent pipe

    D.

     Anti-siphonage pipe


  11. The effect of increasing diameter of sewer on the self cleansing velocity is

  12. A.

     To decrease it

    B.

     To increase it

    C.

     Fluctuating

    D.

     Nil


  13. For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be

  14. A.

     X/4

    B.

     X/2

    C.

     X

    D.

     2X


  15. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is

  16. A.

     1

    B.

     100

    C.

     Infinite

    D.

     Zero


  17. The alum, when added as a coagulant in water

  18. A.

     Does not require alkalinity in water for flocculation

    B.

     Does not affect pH value of water

    C.

     Increases pH value of water

    D.

     Decreases pH value of water


  19. Standard BOD is measured at

  20. A.

     20°C - 1 day

    B.

     25°C - 3 day

    C.

     20°C - 5 day

    D.

     30°C - 5 day