Civil Engineering - UPSC Civil Service Exam Questions

31. 

The saturated and dry densities of a soil are respectively 2000 kg/m3 and 1500 kg/m3. The water content (in percentage) of the soil in the saturated state would be

A. 25
B. 33.33
C. 50
D. 66.66

Answer: Option B

Explanation:

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32. 

The beam ABC shown in the given figure is horizontal. The distance to the point of contraflexure from the fixed end 'A' is

A. 0.333 m
B. 0.666 m
C. 0.25 m
D. 0.75 m

Answer: Option A

Explanation:

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33. 

A horizontal beam is hinged at 'R' and supported on rollers at the end 'S'. It carries inclined loads. To determine the support reactions, the funicular polygon

A. must start onjy from the support 'S'
B. must start only from the support 'R'
C. could start only from anywhere on the vertical line through 'S'
D. could start from anywhere between 'R' and 'S'

Answer: Option B

Explanation:

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34. 

A timber beam of rectangular section 100 mm x 50 mm is simply supported at the ends, has a 30 mm x 10 mm steel strip securely fixed to the top surface as shown in the given figure.
The centroid of the "Equivalent timber beam" in this case from the tope surface

A. is 5 mm
B. is 30 mm
C. is 15 mm
D. cannot be predicted

Answer: Option B

Explanation:

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35. 

What is eutrophication of lakes primarily due to ?

A. Multiplication of bacteria
B. Excessive inflow of nutrients
C. Increase in benthic organisms
D. Thermal and density currents

Answer: Option B

Explanation:

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