# Civil Engineering - UPSC Civil Service Exam Questions

21.

In a circular sewer of diameter D, if the depth of flow is D/4, what is the wetted perimeter equal to ?

 A. πD/4 B. πD/2 C. πD/3 D. 2πD/3

Explanation:

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22.

The standard time meridian in India is 82°30'E. If the standard time at any instant is 20 hours 10 minutes, the local mean time for the place at a longitude of 20°E would be

 A. 4h PM B. 4h 10m PM C. lh 20m PM D. 0h 20m AM

Explanation:

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23.

With a vertical point load on the surface when considering the vertical plane passing through the load, the stress gets reduced by 52.3% at a depth of

 A. 0.25 of unit length B. 0.5 of unit length C. 0.75 of unit length D. 1 of unit length

Explanation:

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24.

Consider the following statements
The main reinforcement in the counterfort in a counterfort retaining wall of R.C.C is provided on the :
1. inclined face in front of counterfort.
2. bottom face in. back counterfort.
3. inclined face in back counterfort.
4. bottom face in front counterfort.
Select the correct answer using the codes given below :

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

Explanation:

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25.

In a free vortex, velocity

 A. decreases with radius B. increases with radius C. is constant D. varies inversely as the square of the radius