# Civil Engineering - UPSC Civil Service Exam Questions

36.

For a simple circular curve which one of the following gives the correct relation between the radius R and degree of curve D, for 20 m arc length ?

 A. B. C. D.

Explanation:

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37.

A car negotiates a curve on a slippery road at a constant speed of 10 m/s. If the coefficient of friction is 0.5, what is the minimum radius of the arc in which the car can turn ?

 A. 20 m B. 10 m C. 5 m D. 4 m

Explanation:

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38.

Grid lines on a mapsheet can be plotted mechanically by means of a

 A. rotometer B. pantograph C. coordinatograph D. stereometer

Explanation:

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39.

A municipal sewage has BOD5 of 200 mg/l. It is proposed to treat it and dispose off into a marine environment. For what minimum efficiency should the sewage treatment plant be designed ?

 A. 85% B. 60% C. 50% D. 33.67%

Explanation:

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40.

As the state of strain of an element of dense sand changes from plain strain to trivial condition, the effective angle of internal friction :

 A. increases B. decreases C. remains constant D. first increases and then remains constant