Q.1
In which of the following filters, the rate of filtration is highest?
  • a) Slow sand filter
  • b) Rapid sand filter
  • c) Pressure filter
  • d) Roughing filter
Q.2
The final loss of head in slow sand filter is ______ than rapid sand filter.
  • a) Higher
  • b) Lower
  • c) Slightly Lower
  • d) Equivalent
Q.3
The turbidity of water applied to rapid sand filter is less than _______
  • a) 35-40ppm
  • b) 10-20ppm
  • c) 30-40ppm
  • d) 10-15ppm
Q.4
The period of cleaning of a slow sand filter is ______ than rapid sand filter.
  • a) Smaller
  • b) Larger
  • c) Slightly smaller
  • d) Slightly larger
Q.5
The bacterial removal efficiency of the rapid sand filter is ______ in comparison to slow sand filter.
  • a) More
  • b) Less
  • c) Equal
  • d) Better
Q.6
How is the grain size distribution of sand in rapid sand filter?
  • a) Stratified
  • b) Unlayered
  • c) Layered with heaviest grains at the top
  • d) Layered with lightest grains at the top
Q.7
Consider the following statement.
  • a) Only iii
  • b) i, ii
  • c) i, ii, iii
  • d) ii, iii
Q.8
Consider the following statement.
  • a) Only iii
  • b) i, ii
  • c) i, ii, iii
  • d) ii, iii
Q.9
The filter run in rapid sand filter should not be less than _____ hours.
  • a) 1
  • b) 6
  • c) 12
  • d) 24
Q.10
Consider the following statement.
  • a) i, ii
  • b) i, ii, iii
  • c) ii, iii
  • d) Only iii
Q.11
Rapid sand filters are very efficient in removal of color.
  • a) True
  • b) False
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