# Civil Engineering - UPSC Civil Service Exam Questions

16.

In which one of the following zones is a logarithmic spiral shape of failure surface assumed in the case of bearing capacity analysis of C-φ soils ?

 A. Active zone B. Passive zone C. Radial shear'zone D. Surcharge zone

Explanation:

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17.

The optimum number of revolutions over which concrete is required to be mixed in a mixer machine, is

 A. 10 B. 20 C. 50 D. 100

Explanation:

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18.

A model of a weir made to a horizontal scale of 1/40 and vertical scale of 1/9 discharges 1 litre/sec. Then the discharge in the prototype is estimated as

 A. 1 lps B. 108 lps C. 1080 lps D. 10800 lps

Explanation:

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19.

Which one of the following statements is the correct description of the structure of fibre board ?

 A. Thin slices of superior quality of wood are glued and pressed on the surface of inferior wood B. Steamed mass of wood dusts, wood wool and other vegetable fibres are pressed hard to a thickness varying from 3 mm to 12 mm C. Thin and narrow wood shavings are soaked in a refractory binder material and pressed hard D. Wood veneer backed by fabric mat

Explanation:

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20.

What is the normal depth in a wide rectangular channel carrying 0.5 m3/s discharge at a bed slope of 0.0004 and Manning's n = 0.01 ?

 A. 0.13 m B. 0.32 m C. 0.43 m D. 0.50 m