# Civil Engineering - UPSC Civil Service Exam Questions

6.

The following data pertain to a sewage sample :
Initial D.O = 10 mg/l
Final D.O. = 10 mg/1 Dilution to 1%
The BOD of the given sewage sample is

 A. 8 mg/1 B. 10 mg/1 C. 100 mg/1 D. 2 mg/1

Explanation:

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7.

In a simply supported beam of span 'l', each end is restrained against torsion, compression flange being unrestrained. According to IS : 800, the effective length of the compression flange will be equal to

 A. 0.65l B. 0.85l C. 0.75l D. 0.70l

Explanation:

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8.

Which one of the following is the correct statement ? Penetration to know bitumen grade is measured in

 A. one-hundredth of mm B. one-tenth of mm C. one-tenth of an inch D. one micron

Explanation:

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9.

Which one of these methods of Tunnel Construction is not suitable in rocks ?

 A. Full face method B. Compressed air method C. Heading and benching method D. Drift method

Explanation:

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10.

Consider the following statements regarding uniform flow in an open channel :
1. Energy grade line, water surface and bed slope are parallel to each other.
2. Froude number does not vary from section to section.
3. Velocity of water is the same at all points of the cross-section.
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