Civil Engineering - UPSC Civil Service Exam Questions

16. 

Total elongation of a prismatic bar of length L, weight W, cross-sectional area A and modulus of elasticity E, under its own weight, while hanging vertically, is

A.
B.
C.
D.

Answer: Option C

Explanation:

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17. 

For a partially saturated soil, Δu the increase in pore water pressure, when no drainage is permitted, is expressed as (where A and B are Skempton's pore pressure parameters and Δσ1 and Δσ3 are major and minor principal stress increments)

A. Δu = B[Δσ3 + A(Δσ1 - Δσ3)]
B. Δu = A[Δσ3 + B(Δσ1 - Δσ3)]
C. Δu = Δσ3 + A(Δσ1 - Δσ3)]
D. Δu = Δσ3 + B(Δσ1 - Δσ3)]

Answer: Option A

Explanation:

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18. 

The shear force diagram for a simple supported beam of span 'l' is given in the figure. The maximum bending moment is

A.
B.
C. Wl1
D. W(l - 2l1)

Answer: Option C

Explanation:

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19. 

A compound bar consisting of material A and B is tightly secured at the ends. The coefficients of thermal expansion of A is more than that of B. When the temperature is increased the stresses induced will be

A. tensile in both the materials
B. tensile in material A and compressive in material B
C. compressive in material A and tensile in material B
D. compressive in both the materials

Answer: Option C

Explanation:

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20. 

Couple M is applied at C on a simply supported beam AB. What is the maximum shear force for the beam ?

A. Zero
B. M
C. 2 M/3
D. M/3

Answer: Option D

Explanation:

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