Civil Engineering - UPSC Civil Service Exam Questions

21. 

Consider the following statements relating to hydraulic gradient line and energy gradient line
1. In the case of a fluid flowing in a pipeline, hydraulic gradient line and energy gradient line may coincide.
2. The line joining the points representing piezometric heads is known as hydraulic gradient line.
3. In the case of ideal fluid, energy gradient line is always horizontal.
4. Hydraulic gradient line has a downward slope in the case of flow through pipes.
Of these statements :

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

Answer: Option C

Explanation:

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22. 

An open cylindrical vessel with axis vertical and filled with a liquid is falling freely with an acceleration What will be the absolute pressure at the base of the vessel ?

A. Equal to liquid column
B. Below atmospheric pressure
C. Above atmosphere pressure
D. Equal to atmosphere pressure

Answer: Option A

Explanation:

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23. 

Dechlorination of water is achieved by adding

A. sodium thiosulphate
B. sodium sulphate
C. sodium hexametaphosphate
D. sodium bisulphate

Answer: Option A

Explanation:

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24. 

On which of the following is the working principle of concrete hammer for non-destructive test based ?

A. Rebound deflections
B. Radioactive waves
C. Ultrasonic pulse
D. Creep-recovery

Answer: Option A

Explanation:

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25. 

Given for a soil sample :
Degree of saturation = 90%
Specific gravity of soil grains = 2.70
Void ratio = 0.30
The water content of the sample is

A. 10%
B. 13.5%
C. 22.5%
D. 35%

Answer: Option A

Explanation:

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