Removal of Iron, Manganese, Colour, Odour and Taste MCQ

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• Which of the following regarding ozonation is incorrect?
  ক

  Improves the appearance of water

  খ

  Removes traces of color

  গ

  Remove odor

  ঘ

  Remove phenolic and algae taste
• The taste produced by a microorganism, can be controlled by ____________
  ক

  Potassium per-manganate

  খ

  Potassium dichromate

  গ

  Sodium chloride

  ঘ

  Iodine
• Removal of iron from water takes place at a pH of ______
  ক

  1.5

  খ

  3

  গ

  8.2

  ঘ

  9.4
• When small amounts of iron and manganese are present in water, they are removed by ____________
  ক

  Aeration

  খ

  Coagulation

  গ

  Manganese zeolite

  ঘ

  Filtration
• Removal of manganese from water takes place at a pH of ______
  ক

  1.5

  খ

  3

  গ

  6

  ঘ

  9.4
• For removal of manganese from water ________ mg of oxygen is required.
  ক

  0.14

  খ

  0.50

  গ

  0.29

  ঘ

  0.90
• For removal of iron from water ________ mg of oxygen is required.
  ক

  0.14

  খ

  0.50

  গ

  1

  ঘ

  1.5
• By which process dissolved manganese compounds can be converted into insoluble manganese compounds?
  ক

  Aeration

  খ

  Coagulation

  গ

  Sedimentation

  ঘ

  Flocculation
• By aeration process, dissolved iron is oxidized into ____________
  ক

  Ferrous oxide

  খ

  Ferric oxide

  গ

  Ferrous hydroxide

  ঘ

  Ferric hydroxide
• The brown tinge in the water is due to the presence of ____________
  ক

  Zinc

  খ

  Copper

  গ

  Iron

  ঘ

  Manganese
• The reddish tinge in the water is due to the presence of ____________
  ক

  Zinc

  খ

  Copper

  গ

  Iron

  ঘ

  Manganese
• The presence of Sulfate iron in the water results in ____________
  ক

  Odorless water

  খ

  Acidity in water

  গ

  Colorless water

  ঘ

  Growth of crenothrix in water mains
• What concentration of iron and manganese will cause unpleasant taste and odor of water?
  ক

  1ppm

  খ

  2ppm

  গ

  3ppm

  ঘ

  >3ppm
• Iron and Manganese are generally present in water supplies as ____________
  ক

  Suspension

  খ

  Solution

  গ

  Colloidal particles

  ঘ

  Either suspension or solution