Civil Engineering - UPSC Civil Service Exam Questions

26. 

The process by which a mass of saturated soil is caused by external forces to suddenly lose its shear strength and to behave as a fluid is called

A. piping
B. slide
C. quick condition
D. liquefaction

Answer: Option C

Explanation:

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27. 

In steady laminar flow of a liquid through a circular pipe of internal diameter D, carrying a constant discharge, the hydraulic gradient is inversely proportional to

A. D
B. D2
C. D4
D. D5

Answer: Option B

Explanation:

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28. 

A pipe line, 2000 m long, carries water. Velocity of propagation of pressure wave is 1000 m/s. If the valve at the low stream end is instantaneously closed at time, t = 0, negative water hammer pressure at the valve will last for

A. 0 - 4 S
B. 2 - 4 S
C. 4 - 8 S
D. S - 12 S

Answer: Option B

Explanation:

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29. 

Consider the following statements related to triaxial test :
1. Failure occurs along pre-determined plane.
2. Intermediate and minor principal stresses are equal.
3. Volume changes can be measured.
4. Field conditions can be simulated.
Of these statements :

A. 1, 2 and 3 are correct
B. 1, 2 and 4 are correct
C. 1, 3 and 4 are correct
D. 2, 3 and 4 are correct

Answer: Option D

Explanation:

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30. 

What is the magnitude of the force in the member BD in the figure given above ?

A. 5 kN
B. 7 kN (App)
C. 42kN
D. Zero

Answer: Option D

Explanation:

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