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  1. Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the

  2. A.

     Hardness in water

    B.

     Turbidity in water

    C.

     Dissolved oxygen in water

    D.

     Residual chlorine in water


  3. The hourly variation factor is usually taken as

  4. A.

     1.5

    B.

     1.8

    C.

     2.0

    D.

     2.7


  5. Disinfection of water results in

  6. A.

     Removal of turbidity

    B.

     Removal of hardness

    C.

     Killing of disease bacteria

    D.

     Complete sterilisation


  7. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

  8. A.

     Total alkalinity

    B.

     Total hardness

    C.

     Total hardness total alkalinity

    D.

     Non carbonate hardness


  9. Laying of sewers is usually done with the help of

  10. A.

     A Theodolite

    B.

     A compass

    C.

     Sight rails and boning rods

    D.

     A plane table


  11. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

  12. A.

     TOD > BOD > COD

    B.

     TOD > COD > BOD

    C.

     BOD > COD > TOD

    D.

     COD > BOD > TOD


  13. As compared to shallow wells, deep wells have

  14. A.

     More depth

    B.

     Less depth

    C.

     More discharge

    D.

     Less discharge


  15. As compared to cast iron pipes, steel pipes are

  16. A.

     Heavier

    B.

     Stronger

    C.

     Costlier

    D.

     Less susceptible to corrosion


  17. In water treatment, rapid gravity filters are adopted to remove

  18. A.

     Dissolved organic substances

    B.

     Dissolved solids and dissolved gases

    C.

     Floating solids and dissolved inorganic solids

    D.

     Bacteria and colloidal solids


  19. In facultative stabilization pond, the sewage is treated by

  20. A.

     Aerobic bacteria only

    B.

     Algae only

    C.

     Dual action of aerobic bacteria and anaerobic bacteria

    D.

     Sedimentation