Question 21 : Which type of bacteria has a rod shaped structure?
1. Bacilli
2. Cocci
3. Spirilla
4. Vibrio
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Question 22 : The permissible limit of pH preferred for potable water is ___ppm.
1. 6.5-9
2. 7-8.5
3. 10-14
4. 0-7
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Question 23 : The range for threshold odour number is
1. 0-3
2. 1-5
3. 1-3
4. 0-5
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Question 24 : Identify the correct relation between the following?
1. Dissolved solid = Total solid + Suspended solid
2. Dissolved solid = Total solid – Suspended solid
3. Total solid = Dissolved solid / Suspended solid
4. Dissolved solid = Suspended solid – Total solid
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Question 25 : If the acid and gas are formed in the multiple tube fermentation technique, the test is _____
1. Positive
2. Continued
3. Negative
4. Discarded
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Question 26 : Which of the following is a better test to identify Coliforms?
1. Coliform index
2. Multiple tube fermentation
3. MPN test
4. Membrane filter technique
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Question 27 : The permissible limit of turbidity of domestic water is ____ ppm.
1. 5-10
2. 1-5
3. 10-50
4. 10-30
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Question 28 : Suspended solids are measured by which of the following?
1. Turbidity rod
2. Gravimetric test
3. Chromatography
4. Jackson's turbidity meter
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Question 29 : Which of the following statement is wrong regarding permanent hardness?
1. It is also called carbonate hardness
2. It is due to the presence of sulfates, chlorides and nitrates of calcium and magnesium
3. It cannot be removed by boiling
4. It requires special methods of water softening to get removed
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Question 30 : If the PO value is 6, what does it imply?
1. No perceptible odour
2. Very faint odour
3. Very distinct odour
4. Extremely strong odour
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