Consider the following statements. The role of the gravel bed in a rapid sand filter is : 1. To filter out large suspended matter 2. To support the sand bed above it 3. To prevent the escape of sand particles 4. To uniformly distribute the backwash water 5. To prevent algae growth Which of the following statements are correct ? a) 1, 2, 3, 4 and 5 b) 2, 3 and 4 only c) 3, 4 and 5 only d) 1, 2 and 3 only

Consider the following statements.
 The role of the gravel bed in a rapid sand filter is :
1. To filter out large suspended matter
2. To support the sand bed above it
3. To prevent the escape of sand particles
4. To uniformly distribute the backwash water
5. To prevent algae growth
Which of the following statements are correct ?
 a) 1, 2, 3, 4 and 5 b) 2, 3 and 4 only
 c) 3, 4 and 5 only d) 1, 2 and 3 only
by

1 Answer

Answer :

b) 2, 3 and 4 only
by

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