Civil Engineering - UPSC Civil Service Exam Questions

11. 

Which of the following treatments reduce salinity of water
1. Flash mixing and sedimentation
2. Electrodialysis
3. Reverse osmosis
4. Freezing
5. Filtration
Select the correct answer using the codes given below:

A. 1, 2, 3, 4 and 5
B. 2, 3 and 4
C. 1, 3 and 5
D. 1, 2 and 4

Answer: Option B

Explanation:

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12. 

Why is lime added to cement slurry for the topcoat of plastering ?

A. To improve the strength of plaster
B. To stiffen the plaster
C. To smoothen the plaster for ease of spread
D. To make the plaster non-shrinkable

Answer: Option A

Explanation:

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13. 

A concentrated load W moves on the span of a three-hinged arch. The horizontal thrust at the supports is maximum when the load is at which one of the following ?

A. The springing
B. One-sixth of the span from one end
C. Quarter span
D. The crown

Answer: Option D

Explanation:

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14. 

A 30 m steel tape was standardised at 20°C measurements of distances were taken as 15°C. If the coefficient of linear expansion of the material of the tape were 0.00, 00112 degree centigrade, then the error, due to temperature, per tape length would be

A. - 0.00, 00560 m
B. + 0.00, 00560 m
C. + 0.00, 16800 m
D. - 0.00, 16800 m

Answer: Option D

Explanation:

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15. 

The slenderness ratio of a compression member in the context of Rankine's formula is defined as

A.
B.
C.
D.

Answer: Option B

Explanation:

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