# Civil Engineering - UPSC Civil Service Exam Questions

21.

A circular sewer of diameter 1 m carries storm water to a depth of 0.75 m. The hydraulic radius is approximately

 A. 0.3 m B. 0.4 m C. 0.5 m D. 0.6 m

Explanation:

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22.

If the staff intercept on a staff located at 100 m from the level for five division deviation of the bubble is 0.050 m and if the length of one division of the bubble is 2 mm, then the radius of curvature of the bubble is 0.050 m and if the length of one division of the bubble is 2 mm, then the radius of curvature of the bubble tube is

 A. 2.02 m B. 2.20 m C. 20.00 m D. 20.20 m

Explanation:

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23.

If the magnitude of the resultant of two forces F and 2F acting at a point O is 50 N, and the included angle between F and 2F is 90°, then what is the magnitude of F ?

 A. F = 10 N B. F = 502 N C. F = 252 N D. F = 105 N

Explanation:

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24.

Consider the following assumptions in the analysis of a plane truss
1. The individual members are straight.
2. The individual members are connected by frictionless hinges.
3. The loads and reactions act only at the joints.
Of these assumptions :

 A. 1 and 2 are valid B. 1 and 3 are valid C. 2 and 3 are valid D. 1, 2 and 3 are valid

Explanation:

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25.

In a shear test on cohesionless soils, if the initial void ratio is less than the critical void ratio, the sample will :

 A. increase in volume B. initially increase in volume and then remain constant C. decrease in volume D. initially decrease and then increase in volume