Civil Engineering - UPSC Civil Service Exam Questions

1. 

Consider the following statements :
If a simply supported beam of uniform cross-section is subjected to a clockwise moment at the left support and an equal anticlockwise moment at the right support, then the
1. B.M.D. will be in the shape of a rectangle.
2. S.F.D. will be a straight line coinciding with the base.
3. deflection curve will be in the shape of a circular arc.
Of these statements :

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

Answer: Option C

Explanation:

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2. 

Which one of the following related to domestic potable water quality is correct?

A. Turbidity (on Silica scale) is 15-20 ppm or mg/lit.
B. Colour (on Cobalt scale) is 15-25 ppm or mg/lit.
C. Hardness (expressed as Ca CO3 equivalent) is 75-115 ppm or mg/lit
D. BOD is 20 ppm or mg/lit

Answer: Option C

Explanation:

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3. 

Which one of the following pairs in not correctly matched ?

A. Lame's constant : Thick cylinder
B. Macaulay's method : Deflection of beams
C. Euler's method : Theory of columns
D. Eddy's theorem : Torsion of shafts.

Answer: Option D

Explanation:

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4. 

BOD is preferred to COD as an index of sewage concentration because

A. BOD represents both carbonaceous and nitrogenous organic matter while COD may indicate carbonaceous matter only
B. BOD test is easier to perform and gives more reliable result
C. BOD relates specifically to putrescible organic matter which is the most objectionable sewage constituent
D. COD relates to the impurities which can only removed by chemical treatment which is expensive

Answer: Option B

Explanation:

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5. 

Consider the following systems :
1. Trusses and purlins
2. Suspension system
3. Flat grid roof
4. Shells
When these are used in single deck industrial structures, the correct sequence in increasing order of spans will be

A. 3, 1, 2, 4
B. 1, 3, 2, 4
C. 3, 1, 4, 2
D. 2, 4, 1, 3

Answer: Option A

Explanation:

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