# Civil Engineering - UPSC Civil Service Exam Questions

11.

Consider the following statements :
Curing of concrete is necessary because
(a) concrete needs more water for chemical reaction
(b) it is necessary to protect the water initially mixed in concrete from being lost during evaporation
(c) penetration of surrounding water increases the strength of concrete Which of the statements given above is/are correct ?

 A. 1, 2 and 3 B. 1 and 3 only C. 2 only D. 3 only

Explanation:

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12.

The combined correction for curvature and refraction for a distance of 1400 m is

 A. 0.153 m B. 0.132 m C. 0.094 m D. 0.021 m

Explanation:

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13.

Given that for a soil deposit,
K0 = earth pressure coefficient at rest,
Ka = active earth pressure coefficient,
Kp = passive earth pressure coefficient and
u = Poisson's ratio, the value of (1 - μ) is given by

 A. Ka/Kp B. K0/Ka C. KP/Ka D. 1/K0

Explanation:

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14.

In water treatment process, the chemical used for defluoridation is

 A. Alum B. Lime C. Potassium permanganate D. Sodium aluminate

Explanation:

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15.

As elastic bar of length 'l', cross-sectional area A, Young's modulus of elasticity E and self-weight W is hanging vertically. It is subjected to a load P applied axially at the bottom end. The total elongation of the bar is given by.

 A. WI/AE + PI/AE B. WI/2AE + PI/AE C. WI/2AE + PI/2AE D. WI/AE + PI/2AE