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Home Biochemical Engineering Water Treatment Comments

  • Question
  • 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

  • Correct Answer
  • 0.001 mg/l 


  • Water Treatment problems


    Search Results


    • 1. Lagoons may be characterized as

    • Options
    • A. anaerobic
    • B. facultative
    • C. aerated
    • D. all of these
    • Discuss
    • 2. Acid used mostly for removal of milk stone is

    • Options
    • A. phosphoric acid
    • B. nitric acid
    • C. gluconic acid
    • D. tartaric acid
    • Discuss
    • 3. The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is

    • Options
    • A. 600 ppm
    • B. 300 ppm
    • C. 500 ppm
    • D. 1000 ppm
    • Discuss
    • 4. The purest form of naturally occurring water is

    • Options
    • A. rain water
    • B. river water
    • C. pond water
    • D. well water
    • Discuss
    • 5. Permanent hardness of water is caused by the presence of

    • Options
    • A. bicarbonates of calcium and magnesium
    • B. carbonates of sodium and potassium
    • C. chlorides and sulfates of calcium and magnesium
    • D. phosphates of sodium and potassium
    • Discuss
    • 6. 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
    • 7. 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
    • 8. Both temporary and permanent hardness of water can be removed by

    • Options
    • A. boiling
    • B. distillation
    • C. filtration
    • D. decantation
    • Discuss
    • 9. Permanent hardness of water may be removed by the addition of

    • Options
    • A. lime
    • B. soda ash
    • C. potassium permagnate
    • D. sodium bicarbonate
    • Discuss
    • 10. 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
    • Discuss


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