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  • Question

  • Pick out the one which is not a chemical coagulant.


  • Options
  • A. Aluminium sulphate
  • B. Ferrous sulphate
  • C. Hydrated lime
  • D. Chloramine

  • Correct Answer
  • Chloramine 

    • Environmental Engineering problems

    Search Results

    • 1. Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.

    • Options
    • A. 20
    • B. 100
    • C. 400
    • D. 200
      • Discuss
    • 2. Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

    • Options
    • A. 25
    • B. 50
    • C. 80
    • D. 120
      • Discuss
    • 3. In water treatment, alum[Al2(SO4)3] is used for the process of

    • Options
    • A. filtration
    • B. coagulation
    • C. sedimentation
    • D. disinfection
      • Discuss
    • 4. When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell.

    • Options
    • A. 0.01
    • B. 0.1
    • C. 1
    • D. 4
      • Discuss
    • 5. __________ is removed from water by lime-soda process.

    • Options
    • A. Foul smell and taste
    • B. Iron and manganese
    • C. Temporary hardness
    • D. Permanent hardness
      • Discuss
    • 6. Main pollutants released from petroleum refineries is

    • Options
    • A. CO, SO2 & H2S.
    • B. CO2, NO & SO3.
    • C. CO2, H2S & NO2.
    • D. SO3, NO2 & CO2.
      • Discuss
    • 7. Thermal pollution due to excessive heat & temperature in the working place causes

    • Options
    • A. reduction in working efficiency of manpower.
    • B. fatigue.
    • C. high breathing rate.
    • D. all (a), (b) & (c).
      • Discuss
    • 8. Green house effect is accentuated by

    • Options
    • A. deforestation.
    • B. rapid industrialisation.
    • C. increased transportation activity.
    • D. all (a), (b) and (c).
      • Discuss
    • 9. Radioactive substances present in the polluted water stream can be removed by

    • Options
    • A. biological oxygen treatment.
    • B. coagulation and filtration.
    • C. adsorption in ion exchange materials.
    • D. none of these.
      • Discuss
    • 10. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

    • Options
    • A. pipe vibrations.
    • B. cavitation.
    • C. boundary layer separation.
    • D. fluctuation in liquid flow.
      • Discuss

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