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| Q.5 | As per recommendations of National Building organization of India, for small sewers with 100 mm diameter, what is the gradient required to generate the self cleaning velocity? | |
| Ans | A. 1 in 90 | |
| B. 1 in 30 | ||
| C. 1 in 120 | ||
| D. 1 in 60 |
Correct Ans Provided: D
