# Civil Engineering - UPSC Civil Service Exam Questions

21.

The approximate proportion of dry cement mortar required for brick work is

 A. 60% B. 45% C. 30% D. 10%

Explanation:

No answer description available for this question. Let us discuss.

22.

The waste stabilization ponds can be

 A. aerobic B. anaerobic C. facultative D. any of the above

Explanation:

Waste or Wastewater Stabilization Ponds (WSPs) are large, man-made water bodies in which blackwater, greywater or faecal sludge are treated by natural occurring processes and the influence of solar light, wind, microorganisms and algae . The ponds can be used individually, or linked in a series for improved treatment. There are three types of ponds, (1) anaerobic, (2) facultative and (3) aerobic (maturation), each with different treatment and design characteristics.
Source: https://www.sswm.info/node/8199

23.

The changes that take place during the process of consolidation of a saturated clay would include

 A. an increase in pore water pressure and an increase in effective pressure B. an increase in pore water pressure and a decrease in effective pressure C. a decrease in pore water pressure and a decrease in effective pressure D. a decrease in pore water pressure and an increase in effective pressure

Explanation:

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24.

Consider the following statements :
1. Water hammer can develop in an unsteady flow only.
2. Time required for rapid closure of valve is between 2 L/C and 4 L/C where L is the pipe length and C is the celerity of wave.
3. In flexible water column theory, pipe may expand and water may compress in the flow system.
4. Joukowskyhas carried out the mathematical analysis of water hammer.
Which is the above statements relating to water hammer in pipes are correct ?

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

Explanation:

No answer description available for this question. Let us discuss.

25.

It is required to determine by periodical soundings, the rate at which silting or scouring is taking place in a harbour. Which one of the following methods is best suited for locating the positions of the soundings?

 A. Range and time intervals B. Two angles from the boat C. Tachometric observations D. Intersecting ranges