Question 1 : By which process, odour producing substances is oxidized?
1. Chlorination
2. Liming
3. Re-carbonation
4. Super-chlorination
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Question 2 : In which form of solute stabilization, hydrogen sulfide in water is oxidized into sulfate?
1. Chlorination
2. Liming
3. Re-carbonation
4. Super-chlorination
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Question 3 : In which type of aerator, the flow of water is divided into fine streams and small droplets?
1. Cascade aerator
2. Inclined apron aerator
3. Spray aerator
4. Gravel bed aerator
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Question 4 : What is the size of coarse screen used in pretreatment of water?
1. 25mm
2. 50mm
3. 75mm
4. 100mm
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Question 5 : State whether the following statement is True or False.
Micro strainers are used to remove color in water.
1. True
2. False
3.
4.
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Question 6 : Which process of water treatment is done to avoid floating debris, branches, trees or other large particles suspended in water?
1. Screening
2. Aeration
3. Primary sedimentation
4. Secondary sedimentation
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Question 7 : Solids are removed from the water by which of the following unit operation?
1. Inter facial contact
2. Solid stabilization
3. Ion transfer
4. Solids transfer
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Question 8 : The coarse screen is inclined at _____ to facilitate the cleaning or raking.
1. 300
2. 350
3. 450
4. 900
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Question 9 : Organic contaminants are removed from the water by the process of ______
1. Water softening
2. Demineralization
3. Absorption
4. Adsorption
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Question 10 : The head loss through screen depends on
1. Shape of screen elements
2. Open area, block area
3. Approach velocity
4. Nature of their construction, approach velocity
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