This set of Applied Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Biological Oxidation Process”.
1. In biological oxidation process, depending on the organic load, the oxidation takes place ___________
Explanation: In biological oxidation process, depending on the organic load, the oxidation process takes place up to 4 to 8 hours. Organic impurities are reduced by the biological oxidation process by micro organisms.
2. All impurities are oxidised into the _________ and ___________ in the biological oxidation process.
a) Oxygen and water
b) Carbondioxide and water
c) Nitrogen and water
d) Chlorine an water
Explanation: All impurities are oxidised into the carbondioxide and water in the biological oxidation process. The sludge formed in this process will be settled down quickly and gives clear supernatant.
3. The water after removing of sludge in the biological oxidation process is treated with ____________
Explanation: The water after removing of sludge in the biological oxidation process is treated with the chlorine or bleaching powder to make it more safe and let it into surface water.
4. Trickling filter method is ___________ than the activated sludge process.
c) Very fast
Explanation: Trickling filter method is slow process than that of the activated sludge process. This process is convenient and cheaper process than the activated sludge process.
5. The depth of the rectangular circular tanks in the trickling filters method is having the depth of ____________
Explanation: The depth of the rectangular circular tanks in the trickling filters method is having the depth of the 2 metres packed with broken stone pieces or coal etc.
6. Periodic cleaning is used to _________
a) Increase efficiency
b) Decrease efficiency
c) Increase pressure
d) Decrease dissolved oxygen
Explanation: Periodic cleaning is necessary to remove excess sludge in the water. So, it is useful to increase the efficiency of the process.
7. In the trickling filter process, the _________ build up and they block the passage.
a) Sludge formed
b) Dissolved impurities
c) Dissolved solids
d) Micro organisms
Explanation: The micro organism built up and they block the passage and then the rate of flow drops considerably.
8. Dried sludge can be used as _________
Explanation: Dried sludge can be used as the fertilizer. It is one of the main advantages. The sludge is de watered by the filtration in sand beds.
9. The unpleasant odour of the water is due to presence of the __________
d) Dissolved oxygen
Explanation: The unpleasant odour of the water is due to the presence of the phenols, hydrogen sulphides, chlorine and organic sulphur compounds.
10. __________ imparts peculiar odour to the water.
a) Decaying organic matter
d) Dissolved oxygen
Explanation: The bad odour of water is due to the phenols, decaying organic matter and phenols. The peculiar odour is due to the detergents and pesticides.
11. Reacting the water with _________ removes the odour due to the phenols.
Explanation: The chlorination of water and reacting the water with the potassium permanganate removes the odour of water due to phenols.
12. The treatment of water with _________ improves the taste of water.
Explanation: The treatment of water with the ozone improves the taste of the water and the bed of activated carbon removes the colour.
13. How many methods of removing the radio active impurities are there?
Explanation: There are two types of methods. They are: By absorbing the radio active elements by using suitable absorbent. Allowing of such periods at which it separates from water.
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