Civil Engineering - UPSC Civil Service Exam Questions

21. 

What is the recommended grade of tar for grouting purpose ?

A. RT - 1
B. RT - 2
C. RT - 3
D. RT - 5

Answer: Option D

Explanation:

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22. 

Which of the following statements is/are true in relation to the term 'detention period' in a settling tank?
1. It may be determined by introducing a dye in the inlet and timing its appearance at the outlet.
2. Greater the detention period, greater the efficiency of removal of settleable matter.
3. It is the time taken for any unit of water to pass through the setting basin.
4. It is usually more than the flowthrough period.
Select the correct answer using the codes given below :

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

Answer: Option A

Explanation:

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23. 

If a soil sample of weight 0.18 kg having a volume of 10-4 m3 and dry unit wt. of 1600 kg/m3 is mixed with 0.02 kg of water then the water content in the sample will be

A. 30%
B. 25%
C. 20%
D. 15%

Answer: Option B

Explanation:

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24. 

With 'n' variables and 'm' fundamental dimensions in a system, which one of the following statements relating to the application of the Buckingham's Pi Theorem is incorrect ?

A. With experience, pi terms can be written simply by inspection of variables in a flow system
B. Buckingham's pi theorem is not directly applicable in compressible flow problem
C. Buckingham's pi theorem yields dimensionless pi terms given by the difference between the number of variables and the number of fundamental dimensions
D. Buckingham's pi theorem reduces the number of variables by the number of fundamental dimensions involved.

Answer: Option B

Explanation:

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25. 

Two sources generate noise levels of 90 dB and 94 dB respectively. The cumulative effect of these two noise levels on the human ear is

A. 184 dB
B. 95.5 dB
C. 94 dB
D. 92 dB

Answer: Option B

Explanation:

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