# Civil Engineering - UPSC Civil Service Exam Questions

16.

The distance between two bench marks is 1000 m. If during levelling, the total error due to collimation, curvature and refraction is found to be + 0.120 m, then the magnitude of the collimation error is

 A. 0.00527 m B. 0.0527 m C. 0.527 m D. 0.673 m

Explanation:

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17.

Mercury (density = 13600 kg/m3, σ = 0.49N/mm internal diameter open-ended capillary tube is inserted in the middle of the beaker into the mercury. The meniscus in the tube will be below the external mercury surface by how much distance?

 A. 4.2 mm B. 5.7 mm C. 6.8 mm D. 7.3 mm

Explanation:

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18.

Which one of the following is considered to be an advantage of the heading and benching method of tunes construction ?

 A. It is suitable for construction in unstable rocks B. In this method, it is easy to install timber support C. Tunnelling can be continous and the work can be expedited D. In case of excessive water, it is easy to take corrective steps

Explanation:

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19.

In a close-coiled helical spring subjected to an axial load, other quantities remaining the same, if the wire diameter is doubled, then the stiffness of the spring when compared to the original one, will become

 A. twice B. four times C. eight times D. sixteen times

Explanation:

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20.

The plastic section modulus of a rectangular section of width 100 mm and depth 12 mm is

 A. 1000 mm3 B. 1800 mm3 C. 2400 mm3 D. 3600 mm3