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UPSC Civil Service Exam Questions

Q1: To make certain that the backfill material is more pervious than the soil to be drained, the relationship used in

A (D15)Filter ≤ 5 (D85)Protected soil

B (D15)Filter ≥ 5 (D85)Protected soil

C (D15)Filter ≥ 5 (D15)Protected soil

D (D15)Filter ≤ 5 (D15)Protected soil

ANS:D - (D15)Filter ≤ 5 (D15)Protected soil

(D15)filter/(D85)soil<5.
4<((D15)filter/(D15)soil)<20.
(D50)filter/(D50)soil<25.

Hence, option D is correct.



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