Question 1 : Calculate the percentage of relative stability, given 5 day incubation period at 370C.
1. 50%
2. 60%
3. 90%
4. 99%
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Question 2 : Which of the following is an end product formed from both the aerobic and anaerobic decomposition of organic matter?
1. NO₃
2. CH₄
3. H₂S
4. CO₂
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Question 3 : Imhoff cone is used to measure the _______
1. Suspended solids
2. Settleable solids
3. Dissolved solids
4. Total solids
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Question 4 : When the sewage becomes stronger, the turbidity of wastewater
1. Increases
2. Decreases
3. Becomes constant
4. Slightly decrease
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Question 5 : State whether the following statement is true or false.
BOD of wastewater having aerobic oxidation is more than that, having anaerobic oxidation.
1. True
2. False
3.
4.
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Question 6 : The expression of relative stability at 37^oC is given by
1. S = (1-(0.794)^T37
2. S = 100 (1-(0.794) ^T37)
3. S = 1-(0.794) ^T20
4. S = 100 (1-(0.630)^T37)
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Question 7 : Which chemical is used for the titration of waste water for finding its chloride content?
1. Potassium chloride
2. Sodium chloride
3. Potassium chromate
4. Potassium dichromate
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Question 8 : Which of the following represents the physical characteristics of water?
1. Chloride content
2. BOD
3. Turbidity
4. COD
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Question 9 : The number of stages required for the completion of aerobic oxidation is
1. 1
2. 2
3. 3
4. 4
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Question 10 : The full form of BOD is
1. Biodegradable oxygen demand
2. Biological oxygen demand
3. Biochemical oxygen demand
4. Bandwidth on demand
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