Civil Engineering - UPSC Civil Service Exam Questions

46. 

If the CBR value obtained at 5 mm penetration is higher than that at 2.5 mm, then the test is repeated for checking ; and if the check test reveals a similar trend, then the CBR value is to be reported as the

A. Mean of the values for 5 mm and 2.5 mm penetrations
B. Higher value minus the lower value
C. Lower value corresponding to 2.5 mm penetration
D. Higher value obtained at 5 mm penetration

Answer: Option D

Explanation:

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47. 

If a descending gradient of 1 in 25 meets an ascending gradient of 1 in 40, then the length of valley curve required for a headlight sight distance of 100 m will be

A. 30 m
B. 130 m
C. 310 m
D. 630 m

Answer: Option B

Explanation:

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48. 

In rock masses reduction in strength occurs due to the presence of relatively large quantities of

A. silica
B. iron oxides
C. orthoclase
D. hornblende

Answer: Option D

Explanation:

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49. 

What is the zone where fish life might tend to progressively dwindle when waste water, is discharged into a river, called ?

A. zone of degradation
B. zone of active decomporsition
C. zone of mixing
D. zone of recovery

Answer: Option B

Explanation:

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50. 

Which one of the following states of field compaction of sand deposit truly represents the corrected standard penetration test value : N (corrected) = 27 ?

A. Loose
B. Medium dense
C. Dense
D. Very dense

Answer: Option B

Explanation:

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