Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 3 (Q.No. 28)
28.
Following data are given for two soil samples A and B :
Sample A : Void ratio = 1, total volume = 1 m3
Sample B : Void ratio = 2, total volume = 1 m3.
The two samples are mixed and compacted in a mould to a volume of 1 m3. Which one of the following figures correctly indicates the porosity of the compacted soil ?
Sample A : Void ratio = 1, total volume = 1 m3
Sample B : Void ratio = 2, total volume = 1 m3.
The two samples are mixed and compacted in a mould to a volume of 1 m3. Which one of the following figures correctly indicates the porosity of the compacted soil ?
Discussion:
14 comments Page 1 of 2.
Faisal Moiz said:
6 years ago
Vs(total) = Vs1 + Vs2.
1/1+e = (1/1+1) + (1/1+2).
1/1+e = 1/2 + 1/3,
1/1+e = .5+.33,
1/1+e = .83,
1+e = 1/.83 (cross multiplication).
1+e = 1.2,
e = .2,
n = e/1+e,
n = .2/1.2,
n = .17,
So in percent .17x100 = 17%.
1/1+e = (1/1+1) + (1/1+2).
1/1+e = 1/2 + 1/3,
1/1+e = .5+.33,
1/1+e = .83,
1+e = 1/.83 (cross multiplication).
1+e = 1.2,
e = .2,
n = e/1+e,
n = .2/1.2,
n = .17,
So in percent .17x100 = 17%.
(12)
Bishal said:
4 years ago
@Faisal,
How u wrote Vs=1/1+e?
Can you please elaborate?
How u wrote Vs=1/1+e?
Can you please elaborate?
(3)
Deepak said:
6 years ago
Here Vs = Vtotal/(1+e).
(2)
Dolly said:
7 years ago
How you get Vs?
(1)
Bishal said:
4 years ago
How you write Vs = Vtotal/(1+e)?
Please elaborate it.
Please elaborate it.
(1)
MAYANK said:
10 years ago
Correct answer should be 20%.
Saksham said:
10 years ago
How? Can you give solution please?
Mayank said:
9 years ago
Vs in 1st sample = .5V.
Vs in 2nd sample = .33V.
Vv = V - Vs = 1 -(.5 + .33).
Thus n = Vv/V = .166.
Vs in 2nd sample = .33V.
Vv = V - Vs = 1 -(.5 + .33).
Thus n = Vv/V = .166.
Chhaya said:
8 years ago
Thanks @ Mayank.
Mukesh ranjan said:
8 years ago
@Mayank.
Vv = 1 - 0.83 = 0.17
n = Vv/V.
n = 0.17/1 as V is given 1.
So correct answer is 17%.
Vv = 1 - 0.83 = 0.17
n = Vv/V.
n = 0.17/1 as V is given 1.
So correct answer is 17%.
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