Question 11 : Which method is used to measure the color of water?
1. Gravimetric analysis
2. Chromatography
3. Tintometer method
4. Hydrometer analysis
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Question 12 : Which bacteria cause the reddish brown deposits in the tank?
1. Escherichia coli bacteria
2. Bacterium coli bacteria
3. Iron bacteria
4. Sulphur bacteria
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Question 13 : When depth of insertion of turbidity rod increases, the reading in the turbidity rod ___
1. Decreases
2. Increases
3. First decrease, then increase
4. Remains constant
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Question 14 : ________ represents the bacterial density that is most likely to be present in water.
1. BOD
2. COD
3. MPN
4. Coliform index
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Question 15 : Chlorides are estimated by titration with a standard silver nitrate solution by using _______as indicator.
1. Potassium manganate
2. Potassium chloride
3. Potassium chromate
4. Potassium dichromate
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Question 16 : State whether the following statement is True or False.
Gelatin liquefying bacteria are helpful in the manufacturing of photographic films.
1. True
2. False
3.
4.
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Question 17 : What is the full form of NTU in context with turbidity?
1. Number of transfer unit
2. Neurological turbidity unit
3. Nephelometric turbidity unit
4. Network terminal unit
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Question 18 : What is the concentration of H+ ions in moles/L in water if the pOH value is 6?
1. 10^-6
2. 10^-7
3. 10^-8
4. 10^-9
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Question 19 : State whether the following statement is True or False.
Carbonate hardness can be removed by adding lime to water.
1. True
2. False
3.
4.
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Question 20 : What is the indicator used in EDTA method?
1. Potassium chromate
2. Potassium dichromate
3. Potassium chloride
4. Erio chrome, black T
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