Civil Engineering - UPSC Civil Service Exam Questions

16. 

If the line of sight between two stations A and B, on sea, and 80 km apart, makes tangent at point A, then the minimum elevation of the signal required at B (considering the coefficient of refraction "m" = 0.08 and the mean radius of earth as 6400 km) will be

A. 42 m
B. 210 m
C. 420 m
D. 840 m

Answer: Option C

Explanation:

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17. 

A simply supported beam of uniform cross-section is subjected to a maximum bending moment of 2.25 t.m. If it has rectangular cross-section with width 15 cm and depth 30 cm, then the maximum bending stress induced in the beam will be

A. 50 kg/cm2
B. 100 kg/cm2
C. 150 kg/cm2
D. 225 kg/cm2

Answer: Option B

Explanation:

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18. 

Consider the following statements regarding underreamed piles :
1. They are used in expansive soils.
2. They are of perkcast reinforced concrete.
3. The ratio of bulb to shaft diameters is usually 2 to 3.
4. Minimum spacing between the piles should not be less than 1.5 times the bulb diameter.
of these statements :

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

Answer: Option B

Explanation:

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19. 

What is efflorescence ?

A. Formation of white patches on the brick surface due to insoluble salts in the brick clay
B. Swelling of brick due to presence of carbonaceous matter and gas
C. Deformation of brick due to exposure to rain
D. Impurities in the brick clay which show after burning

Answer: Option A

Explanation:

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20. 

Consider the following statements regarding a beam of uniform cross-section simply supported at its ends and carrying a concentrated load at one of its third points :
1. Its deflection under the load will be maximum.
2. The bending moment under the load will be maximum.
3. The deflection at the mid-point of the span will be maximum.
4. The slope at the nearer support will be maximum.
Of these statements :

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

Answer: Option B

Explanation:

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