Iron & Manganese Removal MCQs : This section focuses on the "Iron & Manganese Removal". These Multiple Choice Questions (MCQs) should be practiced to improve the Iron & Manganese Removal skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
By aeration process, dissolved iron is oxidized into ____________
A. Ferrous oxide
B. Ferric oxide
C. Ferrous hydroxide
D. Ferric hydroxide
Question 2
By which process dissolved manganese compounds can be converted into insoluble manganese compounds?
A. Aeration
B. Coagulation
C. Sedimentation
D. Flocculation
Question 3
For removal of iron from water ________ mg of oxygen is required.
A. 0.14
B. 0.5
C. 1
D. 1.5
Question 4
For removal of manganese from water ________ mg of oxygen is required.
A. 0.14
B. 0.5
C. 0.29
D. 0.9
Question 5
Iron and Manganese are generally present in water supplies as ____________
A. Suspension
B. Solution
C. Colloidal particles
D. Either suspension or solution
Question 6
Removal of iron from water takes place at a pH of ______
A. 1.5
B. 3
C. 8.2
D. 9.4
Question 7
Removal of manganese from water takes place at a pH of ______
A. 1.5
B. 3
C. 6
D. 9.4
Question 8
The brown tinge in the water is due to the presence of ____________
A. Zinc
B. Copper
C. Iron
D. Manganese
Question 9
The presence of Sulfate iron in the water results in ____________
A. Odorless water
B. Acidity in water
C. Colorless water
D. Growth of crenothrix in water mains
Question 10
The reddish tinge in the water is due to the presence of ____________
A. Zinc
B. Copper
C. Iron
D. Manganese
Question 11
The taste produced by a microorganism, can be controlled by ____________
A. Potassium per-manganate
B. Potassium dichromate
C. Sodium chloride
D. Iodine
Question 12
What concentration of iron and manganese will cause unpleasant taste and odor of water?
A. 1ppm
B. 2ppm
C. 3ppm
D. >3ppm
Question 13
When small amounts of iron and manganese are present in water, they are removed by ____________
A. Aeration
B. Coagulation
C. Manganese zeolite
D. Filtration
Question 14
Which of the following regarding ozonation is incorrect?
A. Improves the appearance of water
B. Removes traces of color
C. Remove odor
D. Remove phenolic and algae taste