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
1.88 g/cm3
1.80 g/cm3
1.98 g/cm3
1.70 g/cm3
Explanation:
No answer description is available. Let's discuss.
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.)
(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.
(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.
(1)

Nithin S said:   4 years ago
Theoretically, adding water dosen't change dry density.

Hence, Yd is constant.
(1)

Ankit Kumar soni said:   3 years ago
(1)

Sinha said:   7 years ago
1.71*(1+.1).

Yb = 1.88. wrong.

Manu said:   7 years ago