1.

For rapid sand filter, sand should have the following specifications:

A. Effective size 0.1 – 0.5 mm, ​Uniformity co-efficient = 2 to 4
B. Effective size 0.2 – 0.5 mm, Uniformity co-efficient = 2 to 3
C. Effective size 0.45 – 0.7 mm, Uniformity co-efficient = 1.3 to 1.7
D. Effective size 0.7 – 0.9 mm, Uniformity co-efficient = 1 to 5
Answer» D. Effective size 0.7 – 0.9 mm, Uniformity co-efficient = 1 to 5


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