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  1. Which of the following causes a decrease in per capita consumption?

  2. A.

     Use of metering system

    B.

     Good quality of water

    C.

     Better standard of living of the people

    D.

     Hotter climate


  3. The process in which the chlorination is done beyond the break point is known as

  4. A.

     Pre-chlorination

    B.

     Post chlorination

    C.

     Super chlorination

    D.

     Break point chlorination


  5. Alum as a coagulant is found to be most effective when pH range of water is

  6. A.

     2 to 4

    B.

     4 to 6

    C.

     6 to 8

    D.

     8 to 10


  7. Composting and lagooning are the methods of

  8. A.

     Sludge digestion

    B.

     Sludge disposal

    C.

     Sedimentation

    D.

     Filtration


  9. Most of the bacteria in sewage are

  10. A.

     Parasitic

    B.

     Saprophytic

    C.

     Pathogenic

    D.

     Anaerobic


  11. The per capital consumption of a locality is affected by
    (i) Climatic conditions
    (ii) Quality of water
    (iii) Distribution pressure

  12. A.

     Only (i)

    B.

     Both (i) and (ii)

    C.

     Both (i) and (iii)

    D.

     All (i), (ii) and (iii)


  13. Alkalinity in water is expressed as milligrams per litre in terms of equivalent

  14. A.

     Calcium carbonate

    B.

     Magnesium carbonate

    C.

     Sodium carbonate

    D.

     Calcium hydroxide


  15. Which of the following unit works in anaerobic conditions?

  16. A.

     Sludge digestion tank

    B.

     Sedimentation tank

    C.

     Activated sludge treatment

    D.

     Trickling filters


  17. Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?

  18. A.

     Circle method

    B.

     Equivalent pipe method

    C.

     Hardy cross method

    D.

     Electrical analysis method


  19. The detention period in coagulation tanks is usually kept as

  20. A.

     1 to 2 minutes

    B.

     30 to 45 minutes

    C.

     2 to 6 hours

    D.

     2 to 6 days