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  • Question

  • If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is


  • Options
  • A. 200 ppm
  • B. 225 ppm
  • C. 250 ppm
  • D. None of these.

  • Correct Answer
  • 250 ppm 

    • Waste Water Engineering problems

    Search Results

    • 1. For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

    • Options
    • A. 3 PPm
    • B. 4 PPm
    • C. 5 PPm
    • D. 10 ppm.
      • Discuss
    • 2. For house drainage minimum gradient is

    • Options
    • A. 1 in 60
    • B. 1 in 80
    • C. 1 in 10
    • D. 1 in 400
      • Discuss
    • 3. In olden days the type of section adopted in trunk and out fall sewers was

    • Options
    • A. parabolic shaped
    • B. horse shoe shaped
    • C. egg shaped
    • D. circular shaped.
      • Discuss
    • 4. In sewers the effect of scouring is more on

    • Options
    • A. top side
    • B. bottom side
    • C. horizontal side
    • D. all sides.
      • Discuss
    • 5. For evaporation and measurement of settlable solids, the apparatus used, is

    • Options
    • A. a jar
    • B. a breaker
    • C. a test tube
    • D. an Imhoff cone.
      • Discuss
    • 6. The rate of accumulation of sludge in septic tanks is recommended as

    • Options
    • A. 30 litres/person/year
    • B. 25 litres/person/year
    • C. 30 litres/person/month
    • D. 25 litres/person/month.
      • Discuss
    • 7. House connections to the laterals is generally made by

    • Options
    • A. R.C.C.
    • B. P.C.C.
    • C. Cast iron
    • D. Glazed stonewares.
      • Discuss
    • 8. If the diameter of sewer is 225 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
    • 9. An R.C.C. beam not provided with shear reinforcement may develop cracks in its bottom inclined roughly to the horizontal at

    • Options
    • A. 25°
    • B. 35°
    • C. 45°
    • D. 55°
    • E. 60°
      • Discuss
    • 10. The diameter of longitudinal bars of a column should never be less than

    • Options
    • A. 6 mm
    • B. 8 mm
    • C. 10 mm
    • D. 12 mm
    • E. none of these.
      • Discuss

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