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  • Question

  • Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.

    Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.


  • Options
  • A. Both A and R are true and R is the correct explanation of A
  • B. Both A and R are true but R is not a correct explanation of A
  • C. A is true but R is false
  • D. A is false but R is true.

  • Correct Answer
  • Both A and R are true and R is the correct explanation of A 

    • Waste Water Engineering problems

    Search Results

    • 1. The gas which may cause explosion in sewers, is

    • Options
    • A. carbondioxide
    • B. methane
    • C. ammonia
    • D. carbon monoxide.
      • Discuss
    • 2. The coagulant widely used for sewage treatment, is

    • Options
    • A. alum
    • B. ferric chloride
    • C. ferric sulphate
    • D. chlorinated copperas.
      • Discuss
    • 3. In a circular pipe of length L and diameter d, a viscous liquid is flowing with a velocity v. The loss in head, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • E. none of these.
      • Discuss
    • 4. The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is

    • Options
    • A. water hammer
    • B. hydraulic jump
    • C. critical discharge
    • D. none of these.
      • Discuss
    • 5. Product of Renold number, Froud's number and Mach number is :

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. In a fully mechanised composting plant, involves

    • Options
    • A. mechanized receipt
    • B. mechanized segregation
    • C. mechanized pulverising of refuse
    • D. all of these.
      • Discuss
    • 7. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is

    • Options
    • A. 2.25
    • B. 2.50
    • C. 2.55
    • D. 2.65
    • E. 2.75
      • Discuss
    • 8. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

    • Options
    • A. cast iron sewers
    • B. cement concrete sewers
    • C. glazed bricks sewers
    • D. stone ware sewers.
      • Discuss
    • 9. If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

    • Options
    • A. D
    • B. 1.25 D
    • C. 1.5 D
    • D. 1.75 D
    • E. 2 D.
      • Discuss
    • 10. When drainage to sewage ratio is 20, the peak dry weather flow is

    • Options
    • A. 20% of the design discharge
    • B. slightly less than 5% of the design discharge
    • C. slightly more than 5% of the design discharge
    • D. none of these.
      • Discuss

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