Civil Engineering - UPSC Civil Service Exam Questions

26. 

A cohesionless soil having an angle of shearing resistance of φ, is standing at a slope angle of i. The factor of safety of the slope is tan i

A.
B. tan i - tan φ
C.
D. tan φ - tan i

Answer: Option C

Explanation:

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27. 

Sewage sickness occurs when

A. Sewage contains pathogenic organisms
B. sewage enters the water supply system
C. sewers get clogged due to accumulation of solids
D. voids of soil get closed due to continuous application of sewage on a piece of land

Answer: Option D

Explanation:

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28. 

A steel cable of 2 cm diameter is used to lift a load of 500π kg. Given that, E = 2 x 106 kg/cm2 and the length of the cable is 10 m, the elongation of the cable due to the load will be

A. 0.5 cm
B. 0.25
C. 1 cm
D. 1/π cm

Answer: Option B

Explanation:

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29. 

Consider the following statements regarding tensile test diagrams for carbon steel with varying carbon contents :
As the carbon content increases
1. the ultimate strength of steel decreases
2. the elongation before fracture increases
3. the ductility of the metal decreases
4. the ultimate strength increases.
Of these statements :

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

Answer: Option C

Explanation:

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30. 

Negative skin friction on a pile under vertical compressive load acts

A. downwards and increases the load carrying capacity of the pile
B. downwards and reduces the load carrying capacity of the pile
C. upwards and increases the load carrying capacity of the pile
D. downwards and maintains the same load carrying capacity of the pile

Answer: Option B

Explanation:

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