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  • Question
  • Calgon is used for removal of


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

  • Correct Answer
  • permanent hardness of water 


  • Water Treatment problems


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    • 1. 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
    • 2. Temporary hardness of water may be removed by adding

    • Options
    • A. calcium hydroxide
    • B. calcium carbonate
    • C. calcium chloride
    • D. sodium bicarbonate
    • Discuss
    • 3. The methods used for biological treatment are

    • Options
    • A. lagoon
    • B. activated sludge process
    • C. oxidation ditches
    • D. all of these
    • Discuss
    • 4. 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
    • 5. 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
    • 6. Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?

    • Options
    • A. Chlorination
    • B. Treating with potassium permagnate
    • C. UV radiation
    • D. Treating with bleaching powder
    • Discuss
    • 7. Most enzymes work by

    • Options
    • A. increasing energy of activation
    • B. decreasing energy of activation
    • C. not affecting energy of activation
    • D. none of the above
    • Discuss
    • 8. When [S] = 0.1 *KM, the velocity of an enzyme catalyzed reaction is about:

    • Options
    • A. 0.1 * Vmax
    • B. 0.3 * Vmax
    • C. 0.5 * Vmax
    • D. 0.7 * Vmax
    • Discuss
    • 9. Which of the following refers to pseudo steady state?

    • Options
    • A. d(CE)/dt = 0
    • B. d(Cp)/dt = 0
    • C. d(CES)/dt = 0
    • D. d(Cs)/dt = d(CES)/dt
    • Discuss
    • 10. In the steady state the material balance equation for any component of a system is

    • Options
    • A. rate of addition + rate of removal - rate of formation = 0
    • B. rate of addition - rate of removal + rate of formation = 0
    • C. rate of addition + rate of removal + rate of formation = 0
    • D. none of the above
    • Discuss


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