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Environmental Engineering - Civil Engineering - section-1
  1. The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

    2. A.

     0.2 to 0.4
    B.

     0.4 to 1.0
    C.

     2 to 4
    D.

     5 to 7

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  2. The percentage of chlorine in fresh bleaching powder is about

    3. A.

     10 to 15
    B.

     20 to 25
    C.

     30 to 35
    D.

     40 to 50

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  3. For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be

    4. A.

     Separate system
    B.

     Combined system
    C.

     Partially combined system
    D.

     Partially separate system

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  4. Dissolved oxygen in streams is

    5. A.

     Maximum at noon
    B.

     Minimum at noon
    C.

     Maximum at midnight
    D.

     Same throughout the day

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  5. If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

    6. A.

     4 mm/hr
    B.

     10 mm/hr
    C.

     20 mm/hr
    D.

     40 mm/hr

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  6. For normal sludge, the value of sludge index for Indian conditions is

    7. A.

     0 to 50
    B.

     50 to 150
    C.

     150 to 350
    D.

     350 to 500

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  7. The most common cause of acidity in water is

    8. A.

     Carbon dioxide
    B.

     Oxygen
    C.

     Hydrogen
    D.

     Nitrogen

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  8. The length of rectangular sedimentation tank should not be more than
    (Where ‘B’ is the width of the tank)

    9. A.

     B
    B.

     2B
    C.

     4B
    D.

     8B

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  9. Septic tank is a
    (i) Settling tank
    (ii) Digestion tank
    (iii) Aeration tank

    10. A.

     Only (i)
    B.

     (i) and (ii)
    C.

     (i) and (iii)
    D.

     Only (iii)

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  10. Double filtration is used

    11. A.

     To increase the filtration slow sand filters capacity of
    B.

     To increase the filtration rapid sand filters capacity of
    C.

     For isolated buildings like pools, hotels etc swimming
    D.

     All of the above

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