# 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
Mean of the values for 5 mm and 2.5 mm penetrations
Higher value minus the lower value
Lower value corresponding to 2.5 mm penetration
Higher value obtained at 5 mm penetration
Explanation:
No answer description is available. Let's discuss.

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
30 m
130 m
310 m
630 m
Explanation:
No answer description is available. Let's discuss.

48.
In rock masses reduction in strength occurs due to the presence of relatively large quantities of
silica
iron oxides
orthoclase
hornblende
Explanation:
No answer description is available. Let's discuss.

49.
What is the zone where fish life might tend to progressively dwindle when waste water, is discharged into a river, called ?
zone of active decomporsition
zone of mixing
zone of recovery