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  • Question
  • The chemical oxygen demand (COD)measures the


  • Options
  • A. amount of oxygen required for growth of microorganisms in water
  • B. amount of oxygen that would be removed from the water in order to oxidize pollution
  • C. amount of oxygen required to oxidize the calcium present in waste water
  • D. none of the above

  • Correct Answer
  • amount of oxygen that would be removed from the water in order to oxidize pollution 


  • Water Treatment problems


    Search Results


    • 1. When temporary hard water is boiled, one of the substances formed is

    • Options
    • A. calcium bicarbonate
    • B. calcium sulfate
    • C. hydrogen chloride
    • D. carbon dioxide
    • Discuss
    • 2. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is

    • Options
    • A. 0.05 mg/l
    • B. 0.09 mg/l
    • C. 0.1 mg/l
    • D. 1.0 mg/l
    • Discuss
    • 3. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with

    • Options
    • A. 10% calcium chloride solution
    • B. 10% magnesium sulfate solution
    • C. 10% magnesium chloride solution
    • D. 10% sodium chloride solution
    • Discuss
    • 4. The maximum permissible limit (BIS) of turbidity in drinking water is

    • Options
    • A. 5 NTU
    • B. 10 NTU
    • C. 15 NTU
    • D. 20 NTU
    • Discuss
    • 5. Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as

    • Options
    • A. insoluble carbonates
    • B. insoluble zeolites
    • C. insoluble chlorides
    • D. insoluble sulfates
    • Discuss
    • 6. Hardness of water does not

    • Options
    • A. have any bad effect in boiler
    • B. make cooking of foods difficult
    • C. make it unfit for drinking
    • D. cause difficulty in the washing of clothes with soaps
    • Discuss
    • 7. Permanent hard water may be softened by passing it through

    • Options
    • A. sodium silicate
    • B. sodium bicarbonate
    • C. sodium hexametaphosphate
    • D. sodium phosphate
    • Discuss
    • 8. Sedimentation is a physical process used in wastewater treatment to

    • Options
    • A. remove particles that are less dense than water
    • B. remove particles that are more dense than water
    • C. remove the pertinacious material from the water
    • D. none of the above
    • Discuss
    • 9. Biological oxidation processes usually referred as biological treatment, are the most common form of

    • Options
    • A. primary treatment
    • B. secondary treatment
    • C. tertiary treatment
    • D. all of these
    • Discuss
    • 10. Which of the following chemical is sometime added in the process of coagulation and flocculation?

    • Options
    • A. Aluminum sulphate
    • B. Aluminum oxide
    • C. Calcium chloride
    • D. None of these
    • Discuss


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