Civil Engineering - UPSC Civil Service Exam Questions

46. 

In a laminar boundary layer, the velocity distribution can be assumed to be given, in usual notations, as

Which one of the following is the correct expression for the displacement thickness δ* for this boundary layer ?

A. δ* = δ
B. δ* = δ/2
C. δ* = δ/4
D. δ* = δ/6

Answer: Option B

Explanation:

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47. 

In a plate load test, how is the ultimate load estimated from the load settlement curve on a log-log graph ?

A. Directly
B. By drawing tangents to the curve at the initial and final points
C. By the secant method
D. At 0.2 percent of the maximum settlement

Answer: Option A

Explanation:

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48. 

The standard Proctor compaction curve of a clay is depicted in the above figure. Points A, B and C correspond to three compaction states of the soil, which fall on this curve. For which point(s) is the coefficient of permeability minimum ?

A. A and C
B. A
C. B
D. C

Answer: Option C

Explanation:

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49. 

In which one of the following grades of a highway is an emergency escape ramp provided ?

A. 1 in 200
B. Zero grade
C. Downgrade
D. Upgrade

Answer: Option C

Explanation:

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50. 

Ratio of the width of the car parking area required at kerb for 30° parking relative to 60° parking is approximately

A. 0.5
B. 0.7
C. 0.8
D. 2.0

Answer: Option D

Explanation:

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