Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 2 (Q.No. 1)
1.
A soil has a bulk density of 1.80 g/cm3 at water content of 5%. If the void ratio remains constant, then its bulk density for a water content of 10% will be
Discussion:
14 comments Page 1 of 2.
Rushikesh patil said:
4 years ago
STEP 1. Y= 1.8/(1+0.05)
Y=1.71.
STEP 2. put y value in same formula,
1.71=x/(1+0.1),
X = 1.88.
(X is an unknown bulk density.)
Y=1.71.
STEP 2. put y value in same formula,
1.71=x/(1+0.1),
X = 1.88.
(X is an unknown bulk density.)
(5)
Pradeep Thogiti said:
7 years ago
For bulk density formula, further simplification we get;
(y2)/(y1) = (1+w2)/(1+w1),
=> y2/1.80 = (1+0.1)/(1+.05),
=>y2= 1.88.
(y2)/(y1) = (1+w2)/(1+w1),
=> y2/1.80 = (1+0.1)/(1+.05),
=>y2= 1.88.
(3)
Minnu Rajeev said:
5 years ago
Option D is the correct answer.
(3)
Vel said:
3 years ago
I agree 1.88 is the correct answer.
(3)
Akshay Thakur said:
6 years ago
Option D is correct and the answer is 1.88 gm/cc.
(2)
Pankaj Kalam said:
1 decade ago
Bulk density Yb.
Dry Density Yd.
water content w.
Yb = Yd(1+w).
1.80 = Yd (1+.05).
Yd = 1.8/1.05.
Yd = 1.71.
Yb = 1.71*(1+.1).
Yb = 1.88.
Dry Density Yd.
water content w.
Yb = Yd(1+w).
1.80 = Yd (1+.05).
Yd = 1.8/1.05.
Yd = 1.71.
Yb = 1.71*(1+.1).
Yb = 1.88.
(1)
Nithin S said:
4 years ago
Theoretically, adding water dosen't change dry density.
Hence, Yd is constant.
Hence, Yd is constant.
(1)
Ankit Kumar soni said:
3 years ago
1.88 is the correct answer.
(1)
Sinha said:
7 years ago
1.71*(1+.1).
Yb = 1.88. wrong.
Yb = 1.88. wrong.
Manu said:
7 years ago
1.88 is the right answer.
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