Civil Engineering - UPSC Civil Service Exam Questions - Discussion

3. 

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

Answer: Option D

Explanation:

No answer description available for this question.

Karan said: (Apr 7, 2017)  
Correct Ans is C.

Explanation : For the filter to provide full drainage.
k of filter >= 25k of protected soil.
Where k is permeability and proportional to square of particle size. So,
d15 of filter >= 5 d15 of protected soil.

Lara said: (Jul 8, 2017)  
Which is the correct answer C or D? can you explain for me?

Priya said: (Dec 21, 2017)  
Yes, it's C. I also agree.

Dolly said: (Mar 22, 2018)  
According to me, C is the correct option.

Akash said: (Sep 26, 2019)  
(D15)Filter ≥5 (D15)Protected soil. So, C is correct.

A Ali said: (Nov 9, 2020)  
C should be the right answer.

Amit Singh said: (Jan 31, 2021)  
(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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