Civil Engineering - UPSC Civil Service Exam Questions

16. 

In a cantilever beam, the bending moment at any section of the beam is equal to the

A. area of the shear force diagram between the free end of the beam and that section
B. area of the bending force moment diagram between the free end of the beam and that section
C. the area of shear force diagram between the fixed end of the beam and that section
D. the vertical ordinate at that section in the shear force diagram

Answer: Option A

Explanation:

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17. 

Which one of the following is the correct sound intensity expression with usual notations ?

A. dB = 10 log10 (I/I0)2
B. dB = 10 log10 (I/I0)
C. dB = 10 log10 (I - I0)2
D. dB = 10 log10 (I - I0)

Answer: Option B

Explanation:

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18. 

A three-hinged parabolic arch rib with hinges at abutments and at crown is under the action of uniformly distributed load 'W' per unit length over its entire span 'l' through its crown. The bending moment at quarter span is

A. zero
B. Wl2/8
C. Wl2/12
D. Wl2/24

Answer: Option A

Explanation:

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19. 

A bulldozer operates on a 30 m stretch and moves at 2.4 kmph when pushing the earth, and returns empty at 6 kmph. The time lost in loading and shifting gears per trip is 18 seconds. Its operating factor is nearly 50 min/hour. What is the number of trips made per hour ?

A. 31
B. 33
C. 35
D. 37

Answer: Option D

Explanation:

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20. 

In the case of panel wall subjected to horizontal loads at right angles to the plane of the wall, with the mortar not leaner than M1 type, tensile stress in bending in the vertical direction may be allowed to the extent of

A. 0.4 kg/cm2
B. 0.7 kg/cm2
C. 1.0 kg/cm2
D. 1.2 kg/cm2

Answer: Option C

Explanation:

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