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  • Question
  • A standard test for determination of hardness in water is termed as __________ test.


  • Options
  • A. EDTA
  • B. electometric
  • C. total count
  • D. presumptive

  • Correct Answer
  • EDTA 


  • Environmental Engineering problems


    Search Results


    • 1. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

    • Options
    • A. Hydrogen
    • B. Acetylene
    • C. Carbon monoxide
    • D. Ammonia
    • Discuss
    • 2. The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.

    • Options
    • A. 10
    • B. 200
    • C. 1000
    • D. 2000
    • Discuss
    • 3. Fresh sewage is __________ in nature.

    • Options
    • A. acidic
    • B. neutral
    • C. alkaline
    • D. highly acidic
    • Discuss
    • 4. The main industrial source of emission of hydrogen sulphide air pollutant is

    • Options
    • A. petroleum refineries.
    • B. coal based thermal power plants.
    • C. pulp and paper plant.
    • D. metallurgical roasting & smelting plant.
    • Discuss
    • 5. Iron & manganese present in the polluted water is removed by

    • Options
    • A. simple filtration.
    • B. oxidation followed by settling & filtration.
    • C. chemical coagulation.
    • D. chlorination only.
    • Discuss
    • 6. Which of the following is not a weightless pollutant?

    • Options
    • A. SPM
    • B. Thermal pollution
    • C. Radioactive rays
    • D. Noise pollution
    • Discuss
    • 7. Aerosols present in atmospheric air may be

    • Options
    • A. positively charged.
    • B. negatively charged.
    • C. neutral.
    • D. combination of all (a), (b) & (c).
    • Discuss
    • 8. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by

    • Options
    • A. quenching of hot coke.
    • B. discharging in the river stream.
    • C. filtration and recycling for cooling coke oven gas.
    • D. none of these.
    • Discuss
    • 9. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.

    • Options
    • A. 10000
    • B. 5
    • C. 500
    • D. 1000
    • Discuss
    • 10. In a sedimentation tank, the detention period for water ranges from __________ hours.

    • Options
    • A. 2 to 4
    • B. 8 to 12
    • C. 16 to 20
    • D. 24 to 32
    • Discuss


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