# Civil Engineering - UPSC Civil Service Exam Questions

36.

A flownet constructed to determine the seepage through an earth dam which is homogeneous but anisotropic, gave four flow channels and sixteen equipotential drops. The coefficients of permeability in the horizontal and vertical directions are 4 x 10-7 m/s and 1.0 x 10-7 m/s, respectively. If the storage head was 20 m, then the seepage per unit length of the dam (in m3/s) would be

 A. 5 x 10-7 B. 10 x 10-7 C. 20 x 10-7 D. 40 x 10-7

Answer: Option B

Explanation:

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37.

A roaring rail has which one of the following defects ?

 A. Split on head of rail B. Minute depression and waves on the surface of rails C. Split on web portion of rail D. Square cracks on the surface of rail

Answer: Option B

Explanation:

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38.

While aligning a hill road with a ruling gradient of 1 in 20, horizontal curve of radius 80 m is encountered. The compensated gradient on the curve will be

 A. 1 in 15 B. 1 in 17 C. 1 in 25 D. 1 in 27

Answer: Option C

Explanation:

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39.

Stratification of water with depth in reservoir (with free surface) is based on temperature. The dark stagnant cooler water layer is known as

 A. Epilimnion B. Hypolimnion C. Metalimnion D. Boundary

Answer: Option B

Explanation:

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40.

The following steps are involved in arriving at a unit hydrograph.
1. Estimating the surface runoff in depth.
2. Estimating the surface runoff in volume.
3. Separation of base flow.
4. Dividing surface runoff ordinates by depth of runoff.
The correct sequence of the steps is :

 A. 3 2 1 4 B. 2 3 4 1 C. 3 1 2 4 D. 4 3 2 1

Answer: Option B

Explanation:

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