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  1. As compared to geometrical increase method of forecasting population, arithmetical increase method gives

  2. A.

     Lesser value

    B.

     Higher value

    C.

     Same value

    D.

     Accurate value

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  3. The rate of BOD exerted at any time is

  4. A.

     Directly proportional to BOD satisfied

    B.

     Directly proportional to BOD remaining

    C.

     Inversely proportional to BOD satisfied

    D.

     Inversely proportional to BOD remaining

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  5. If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is
    (i) Presumptive coli-form test
    (ii) Confirmed coli-form test
    (iii) Completed coli-form test

  6. A.

     Only (i)

    B.

     Both (i) and (ii)

    C.

     Both (i) and (iii)

    D.

     All (i), (ii) and (iii)

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  7. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

  8. A.

     10 to 25

    B.

     50

    C.

     75

    D.

     100

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  9. The type of sewer which is suitable for both combined and separate system is

  10. A.

     Circular sewer

    B.

     Egg shaped sewer

    C.

     Horseshoe type sewer

    D.

     Semi-elliptical sewer

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  11. Which of the following is not a water borne disease?

  12. A.

     Dysentery

    B.

     Cholera

    C.

     Typhoid

    D.

     Malaria

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  13. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is

  14. A.

     Reflux valve

    B.

     Sluice valve

    C.

     Air relief valve

    D.

     Pressure relief valve

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  15. The rate of Alteration of pressure filters is

  16. A.

     Less than that of slow sand filters

    B.

     In between the filtration rate of slow sand filters and rapid sand filters

    C.

     Greater than that of rapid sand filters

    D.

     Equal to that of slow sand filters

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  17. A pipe which is installed in the house drainage to preserve the water seal of traps is called

  18. A.

     Vent pipe

    B.

     Anti-siphonage pipe

    C.

     Waste pipe

    D.

     Soil pipe

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  19. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

  20. A.

     N = y + R

    B.

     y = N + R

    C.

     R = N + y

    D.

     R > (N + y)

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