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  1. If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

  2. A.

     1000

    B.

     4000

    C.

     1,00,000

    D.

     4,00,000


  3. The specific gravity of sewage is

  4. A.

     Much greater than 1

    B.

     Slightly less than 1

    C.

     Equal to 1

    D.

     Slightly greater than 1


  5. The effective size of sand particles used in slow sand filters is

  6. A.

     0.25 to 0.35 mm

    B.

     0.35 to 0.60 mm

    C.

     0.60 to 1.00 mm

    D.

     1.00 to 1.80 mm


  7. Chlorine demand of water is equal to

  8. A.

     Applied chlorine

    B.

     Residual chlorine

    C.

     Sum of applied and residual chlorine

    D.

     Difference of applied and residual chlorine


  9. Corrosion in concrete sewers is caused by

  10. A.

     Septic conditions

    B.

     Dissolved oxygen

    C.

     Chlorine

    D.

     Nitrogen


  11. The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

  12. A.

     Steel

    B.

     Cast iron

    C.

     Copper

    D.

     Reinforced cement concrete


  13. The suitable layout of a distribution system for irregularly growing town is

  14. A.

     Dead end system

    B.

     Grid iron system

    C.

     Radial system

    D.

     Ring system


  15. Assertion A: The consumption of water increases with increase in the distribution pressure.
    Reason R: Higher distribution pressure causes more loss and waste of water
    Select your answer according to the coding system given below

  16. A.

     Both A and R is true and R is the correct explanation of A

    B.

     Both A and R is true but R is not the correct explanation of A

    C.

     A is true but R is false

    D.

     A is false but R is true