Civil Engineering - UPSC Civil Service Exam Questions

21. 

Consider the following statement :
1. Hydraulic gradient required to initiate "quick" condition is independent of the ratio of volume of voids of solids in a soil mass.
2. Initiation of piping under hydraulic structures can be prevented by increasing the length of flow path of water.
3. Seepage pressure is independent of the coefficient of permeability.
Of these statement :

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

Answer: Option D

Explanation:

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22. 

Which of the following waste disposal tasks are achieved by a septic tank with its dispersion tranch ?
1. Aerobic sluge digestion
2. Settling and anaerobic sludge digestion
3. Anaerobic sewage stabilisation
4. Bio-oxidation of effluent
Select the correct answer using the codes given below :

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

Answer: Option C

Explanation:

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23. 

The expansion and shrinkage of plywoods are comparatively very low as

A. they are held in position by adhesives
B. they are glued under pressure
C. plies are placed at right angles to each other
D. they are prepared from veneers

Answer: Option C

Explanation:

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24. 

Which one of the following methods is usually adopted for site welding of rails ?

A. Gas pressure welding
B. electric are welding
C. Thermit welding
D. Flash butt welding

Answer: Option B

Explanation:

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25. 

In a simply supported beam AB of span L, the midpoint is C. In case-1, the beam is loaded by a central concentrated load W. In case-2, the beam is subjected to a U.D.L. of intensity w such that wL = W. The ratio of central deflection in case-1 to that in case-2 is

A. 5/3
B. 3/5
C. 5/8
D. 8/5

Answer: Option D

Explanation:

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