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  • Question
  • The common methods used for disinfection in waste water treatment plants are


  • Options
  • A. chlorination
  • B. UV light
  • C. both (a) and (b)
  • D. Phenolic solvent

  • Correct Answer
  • both (a) and (b) 


  • Water Treatment problems


    Search Results


    • 1. Permanent hardness of water may be removed by the addition of

    • Options
    • A. lime
    • B. soda ash
    • C. potassium permagnate
    • D. sodium bicarbonate
    • Discuss
    • 2. Both temporary and permanent hardness of water can be removed by

    • Options
    • A. boiling
    • B. distillation
    • C. filtration
    • D. decantation
    • Discuss
    • 3. Application of quaternary ammonium compounds as sanitizing agents tends to

    • Options
    • A. favor gram positive bacteria
    • B. decrease gram positive bacteria
    • C. increase the percentage of gram(-)ve rods on utensils
    • D. none of the above
    • Discuss
    • 4. Inhibitors are used along with sanitizer to

    • Options
    • A. improve their action
    • B. to prevent corrosion
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 5. The maximum desirable limit (BIS of mercury in the drinking water is

    • Options
    • A. 0.05 mg/l
    • B. 0.9 mg/l
    • C. 0.1 mg/l
    • D. 0.001 mg/l
    • Discuss
    • 6. Coliform bacteria in water is an indication of the presence of

    • Options
    • A. radioactive wastes
    • B. excess fertilizer
    • C. decaying animals and plants
    • D. human feces
    • Discuss
    • 7. The methods used for biological treatment are

    • Options
    • A. lagoon
    • B. activated sludge process
    • C. oxidation ditches
    • D. all of these
    • Discuss
    • 8. Temporary hardness of water may be removed by adding

    • Options
    • A. calcium hydroxide
    • B. calcium carbonate
    • C. calcium chloride
    • D. sodium bicarbonate
    • Discuss
    • 9. Temporary hardness of water is caused by the presence of

    • Options
    • A. chlorides of calcium and magnesium
    • B. sulfates of calcium and magnesium
    • C. bicarbonates of calcium and magnesium
    • D. carbonates of sodium and potassium
    • Discuss
    • 10. Calgon is used for removal of

    • Options
    • A. sodium carbonate
    • B. permanent hardness of water
    • C. potassium carbonate
    • D. none of these
    • Discuss


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