Question 31 : The size of suspended solids lies in the range of ________
1. 10^-3 – 10^-6 mm
2. 10³ – 10⁶ mm
3. 10^-1 – 10^-3 mm
4. 10¹ – 10³ mm
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Question 32 : State whether the following statement is True or False.
Threshold odour number testing is preferred in hot water.
1. True
2. False
3.
4.
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Question 33 : The maximum permissible limit for suspended solids is ___
1. 10 mg/l
2. 20 mg/l
3. 30 mg/l
4. 40 mg/l
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Question 34 : Which of the following statement is wrong regarding turbidity?
1. It is an extent to which light is absorbed by particles in the water
2. It is expressed in ppm
3. It depends on the fineness of particle present in the water
4. Turbidity rod is a laboratory method to measure turbidity
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Question 35 : In which method of determining total hardness of water is based on the premise that hardness producing substance react with soap and form insoluble compounds before lather is produced?
1. Clark's method
2. Hehner's method
3. Versenate method
4. EDTA method
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Question 36 : Which of the following statement is/are correct regarding coliform bacteria?
1. It is gram negative
2. It is rod shaped bacteria
3. It is a harmless aerobic microorganism
1. 1, 2, 3
2. 2, 3
3. 1, 3
4. 1,2
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