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  • Question

  • Which one of the following gases is most significant as air pollutant


  • Options
  • A. Carbondioxide
  • B. Oxygen
  • C. Nitrogen
  • D. Sulphurdioxide.

  • Correct Answer
  • Sulphurdioxide. 

    • Waste Water Engineering problems

    Search Results

    • 1. Which one of the following part of human body withstands minimum radiation

    • Options
    • A. thyroid
    • B. kidneys
    • C. eyes
    • D. ovaries/testis.
      • Discuss
    • 2. The sewer which resists sulphide corrosion, is

    • Options
    • A. Brick sewer
    • B. Cast iron sewer
    • C. R.C.C. sewer
    • D. Lead sewer
    • E. None of these.
      • Discuss
    • 3. For the open drain (N = 0.025) shown in the below figure, the discharge is

    • Options
    • A. 26.88 cumecs
    • B. 27.88 cumecs
    • C. 28.88 cumecs
    • D. 29.88 cumecs.
      • Discuss
    • 4. Ventilating shafts are provided to a sewer line at every

    • Options
    • A. 100 m
    • B. 150 m
    • C. 200 m
    • D. 300 m
    • E. 500 m.
      • Discuss
    • 5. Inter-distance between ventilation columns in a sewer line is kept

    • Options
    • A. 25 to 50 m
    • B. 50 m to 100 m
    • C. 100 m to 150 m
    • D. 150 m to 300 m.
      • Discuss
    • 6. If the diameter of a sewer is 150 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
    • 7. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

    • Options
    • A. 0°C
    • B. 15°C
    • C. 20°C
    • D. 25°C.
      • Discuss
    • 8. Which one of the following statements regarding septic tanks is wrong :

    • Options
    • A. a gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
    • B. the outlet invert level is kept 5 to 7.5 cm below the inlet invert level
    • C. the minimum width of septic level is 90 cm
    • D. the depth of tank is kept equal to its width.
      • Discuss
    • 9. Design period of 40 to 50 years is adopted for

    • Options
    • A. branch sewers
    • B. main sewers
    • C. trunk sewers
    • D. all the above.
      • Discuss
    • 10. The most widely used pump for lifting sewage is

    • Options
    • A. centrifugal pump
    • B. reciprocating pump
    • C. pneumatic ejector
    • D. air pressure pump.
      • Discuss

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