Civil Engineering - UPSC Civil Service Exam Questions

1. 

A soil has a bulk density of 1.80 g/cm3 at water content of 5%. If the void ratio remains constant, then its bulk density for a water content of 10% will be

A. 1.88 g/cm3
B. 1.80 g/cm3
C. 1.98 g/cm3
D. 1.70 g/cm3

Answer: Option A

Explanation:

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2. 

The base width of a soil gravity dam is 25 m. The material of the dam has a specific gravity of 2.56 and the dam is designed as an elementary profile ignoring uplift. What is the approximate allowable height of the dam ?

A. 64 m
B. 40 m
C. 164 m
D. 80 m

Answer: Option B

Explanation:

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3. 

In a gusseted base, when the end of the column is machined smooth for complete bearing, the axial load is transferred to base slab :

A. Fully through fastening
B. Fully by direct bearing
C. 50 % by direct bearing and 50% through fastening
D. 60 % by direct bearing and 40% through fastening

Answer: Option B

Explanation:

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4. 

Which of the following assumptions are made in the analysis of jet impinging normally on a moving plate?
1. Friction between jet and plate is neglected
2. Flow is steady
3. Momentum of jet is unchanged
4. Plate moves at a constant velocity
Choose the correct answer using the codes given below :

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

Answer: Option C

Explanation:

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5. 

A 3000 m long line lying at an elevation of 450 m measures 10 cm on a vertical photograph.
The focal length of the camera is 21 cm. The scale of the photograph for the area having an elevation of 1000 m will be

A. 1 : 27381
B. 1 : 25008
C. 1 : 20606
D. 1 : 30421

Answer: Option A

Explanation:

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