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  • Question

  • Presence of __________ hardness is responsible for the temporary hardness in water.


  • Options
  • A. carbonate
  • B. calcium
  • C. choride
  • D. sulphate

  • Correct Answer
  • calcium 

    • Environmental Engineering problems

    Search Results

    • 1. Foul odour and bad taste of water is removed by treating with

    • Options
    • A. alum
    • B. bleaching powder
    • C. activated carbon
    • D. copper sulphate.
      • Discuss
    • 2. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

    • Options
    • A. 90
    • B. 120
    • C. 150
    • D. 180
      • Discuss
    • 3. Particles having diameter greater than 75 ?m (micrometer = 10-6 mm) are called

    • Options
    • A. grit
    • B. dust
    • C. powder
    • D. smoke
      • Discuss
    • 4. What are the methods of treatment & disposal of radioactive wastes?

    • Options
    • A. Evaporation & chemical precipitation.
    • B. Biological methods & adsorption in ion exchange materials.
    • C. Fixing into a solid mass with cement and sinking deep in the sea.
    • D. All (a), (b) & (c).
      • Discuss
    • 5. Dose of chlorine for disinfection of water is about __________ mg/litre of water.

    • Options
    • A. 0.01
    • B. 0.1
    • C. 0.3
    • D. 1
      • Discuss
    • 6. Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the

    • Options
    • A. gravity settling chamber
    • B. cyclone separator
    • C. electrostatic precipitator
    • D. bag filter
      • Discuss
    • 7. Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.

    • Options
    • A. moderately
    • B. highly
    • C. extremely
    • D. very extremely
      • Discuss
    • 8. Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

    • Options
    • A. biological oxidation.
    • B. skimming off.
    • C. settling out using chemical reagents.
    • D. chlorination.
      • Discuss
    • 9. Presence of soluble organics in polluted water causes

    • Options
    • A. undesirable plants growth.
    • B. depletion of oxygen.
    • C. fire hazards.
    • D. explosion hazards.
      • Discuss
    • 10. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

    • Options
    • A. with greater number of blades.
    • B. of increased diameter.
    • C. both (a) & (b).
    • D. neither (a) nor (b).
      • Discuss

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