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  1. Which of the following values of pH represents a stronger acid?

  2. A.

     2

    B.

     5

    C.

     7

    D.

     10


  3. The distribution mains are designed for

  4. A.

     Maximum daily demand

    B.

     Maximum hourly demand

    C.

     Average daily demand

    D.

     Maximum hourly demand on maximum day


  5. Sewage treatment units are designed for

  6. A.

     Maximum flow only

    B.

     Minimum flow only

    C.

     Average flow only

    D.

     Maximum and minimum flow


  7. For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

  8. A.

     4.5 to 6.0

    B.

     6.5 to 8.0

    C.

     8.5 to 10.0

    D.

     10.5 to 12.0


  9. The pathogens can be killed by

  10. A.

     Nitrification

    B.

     Chlorination

    C.

     Oxidation

    D.

     None of the above


  11. Orthotolidine test is used for determination of

  12. A.

     Dissolved oxygen

    B.

     Residual chlorine

    C.

     Biochemical oxygen demand

    D.

     Dose of coagulant


  13. Period of cleaning of slow sand filters is about

  14. A.

     24 - 48 hours

    B.

     10 - 12 days

    C.

     2 - 3 months

    D.

     1 - 2 year


  15. The rate of filtration in slow sand filters in million litres per day per hectare is about

  16. A.

     50 to 60

    B.

     100 to 150

    C.

     500 to 600

    D.

     1400 to 1500


  17. The working conditions in imhoff tanks are

  18. A.

     Aerobic only

    B.

     Anaerobic only

    C.

     Aerobic in lower compartment and anaerobic in upper compartment

    D.

     Anaerobic in lower compartment and aerobic in upper compartment


  19. The self cleansing velocity for all sewers in India is usually

  20. A.

     Less than 1.0 m/sec

    B.

     1.0 m/sec to 1.2 m/sec

    C.

     1.5 m/sec to 2.0 m/sec

    D.

     3.0 m/sec to 3.5 m/sec