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  1. Which of the following chemical compounds can be used for de-chlorination of water?

  2. A.

     Carbon dioxide

    B.

     Bleaching powder

    C.

     Sulphur dioxide

    D.

     Chloramines

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  3. The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is

  4. A.

     Check valve

    B.

     Sluice valve

    C.

     Safety valve

    D.

     Scour valve

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  5. The suitable method for disinfection of swimming pool water is

  6. A.

     Ultra violet rays treatment

    B.

     Lime treatment

    C.

     By using potassium permanganate

    D.

     Chlorination

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  7. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

  8. A.

     Less and more

    B.

     Less and less

    C.

     More and less

    D.

     More and more

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  9. Disinfection efficiency is

  10. A.

     Reduced at higher pH value of water

    B.

     Unaffected by pH value of water

    C.

     Increased at higher pH value of water

    D.

     Highest at pH value equal to 7

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  11. The time of concentration is defined as

  12. A.

     The time taken by rainfall water to run from most distant point of water shed to the inlet of sewer

    B.

     The time required for flow of water in sewer to the point under consideration

    C.

     Sum of (A) and (B)

    D.

     Difference of (A) and (B)

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  13. The velocity of flow of water in a sedimentation tank is about

  14. A.

     5 to 10 cm/sec

    B.

     15 to 30 cm/sec

    C.

     15 to 30 cm/minute

    D.

     15 to 30 cm/hour

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  15. Hardy cross method of analysis of distribution system
    (i) Involves successive trials
    (ii) Takes economic aspects into account
    (iii) Is time consuming

  16. A.

     Only (i)

    B.

     (i) and (ii)

    C.

     (i) and (iii)

    D.

     All are correct

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  17. A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called

  18. A.

     House sewer

    B.

     Lateral sewer

    C.

     Main sewer

    D.

     Sub-main sewer

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  19. The depression of water table in a well due to pumping will be maximum
    (Where ‘R’ is the radius of influence)

  20. A.

     At a distance R from the well

    B.

     Close to the well

    C.

     At a distance R/2 from the well

    D.

     None of the above

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