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  • Question

  • As compared to fresh river water, sea water contains oxygen


  • Options
  • A. 10% less
  • B. 20% less
  • C. 10% more
  • D. 20% more.

  • Correct Answer
  • 20% less 

    • Waste Water Engineering problems

    Search Results

    • 1. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is

    • Options
    • A. 1 in 60
    • B. 1 in 100
    • C. 1 in 120
    • D. none of these.
      • Discuss
    • 2. Oxidation process results in the formation of

    • Options
    • A. carbon dioxide
    • B. nitrates
    • C. sulphates
    • D. all the above.
      • Discuss
    • 3. Before discharging the foul sewage into rivers, it is generally treated by

    • Options
    • A. screening
    • B. sedimentation
    • C. oxidation
    • D. sludge digestion and disinfection
    • E. all the above.
      • Discuss
    • 4. Boussinesq's equation for ascertaining unit pressure at a depth H on sewers due to traffic loads, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • E. none of these.
      • Discuss
    • 5. D is the diameter of a circular sewer and ? is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is

    • Options
    • A. ?D8/3 = 4 b8/3
    • B. ?D3/8 = 4 b3/8
    • C. ?D2/3 = 4 b2/3
    • D. ?D3/2 = 4 b3/2
    • E. none of these.
      • Discuss
    • 6. Which one of the following resists hydrogen sulphide corrosion

    • Options
    • A. R.C.C.
    • B. Glazed stone wares
    • C. Asbestos cement
    • D. Glazed ware.
      • Discuss
    • 7. Dry weather flow is :

    • Options
    • A. average daily rate of flow
    • B. average monthly rate of flow
    • C. average annual rate of flow
    • D. water supply allowance per capita
    • E. none of these.
      • Discuss
    • 8. In 1000 kg of sewage, the total solids approximate

    • Options
    • A. 0.5 to 1.0 kg
    • B. 1 kg to 2.0 kg
    • C. 5 kg to 7.5 kg
    • D. 7.5 kg to 10 kg.
      • Discuss
    • 9. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

    • Options
    • A. degradation
    • B. active decomposition
    • C. recovery
    • D. cleaner water
    • E. none of these.
      • Discuss
    • 10. In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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