Question 1 : In which type of filter, rate of filtration is low?
1. Slow sand filter
2. Rapid sand filter
3. Gravity filter
4. Pressure filter
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Question 2 : In which action of filtration, particles coarser than the void size is arrested?
1. Mechanical Straining
2. Sedimentation
3. Biological mechanism
4. Electrolytic action
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Question 3 : The rate of filtration of a Micro-Strainer is __________ litres / hour.
1. 10,000-20,000
2. 20,000-30,000
3. 40,000-60,000
4. 50,000-80,000
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Question 4 : In which type of filter, water flows in upward direction?
1. Slow sand filter
2. Rapid sand filter
3. Pressure filter
4. Up flow filter
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Question 5 : The size of Anthracite used in dual media filter is
1. 1-2mm
2. 1.25-2.5mm
3. 3-4mm
4. 4-5mm
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Question 6 : Consider the following statement
1. Slow sand filter is not flexible in variation in demand
2. The rapid sand filter is flexible in fluctuations in demand
3. The method of cleaning of a slow sand filter involves agitation and back-washing
Which of the above statement is/are correct?
1. 1, 2
2. 1, 2, 3
3. 2, 3
4. Only 3
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Question 7 : Which of the following is not commonly used as a filter material in the treatment of water?
1. Sand
2. Anthracite
3. Crushed rock
4. Garnet sand
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Question 8 : Which of the following statement is wrong regarding filtration?
1. It removes fine particle
2. It removes suspended solids not removed by sedimentation
3. It does not remove turbidity
4. It removes color
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Question 9 : What is CU in the expression C_U= D₆₀/D₁₀ where D₆₀ and D₁₀ are the sizes of particle such that 60% and 10% of the particles are finer than these sizes respectively?
1. Coefficient of compaction
2. Coefficient of consolidation
3. Uniformity coefficient
4. Effective size
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Question 10 : What is the value of uniformity coefficient in a pressure sand filter?
1. 1
2. 1.5
3. 2
4. 2.5
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