engineering recuitment APSC AE Civil 2020 Test Series Soil Mechanics and Foundation Engineering Site Investigation and Sub-Soil Exploration
In a rock core sampling method at site, the total length of drilling was 1.0 m in rocky strata. There were five intact pieces of rocks of lengths 150 mm, 200 mm, 75 mm, 50 mm, and 200 mm were collected. The value of Rock Quality Designation (RQD) for the rock sample is:
1
55.0%
2
67.5%
3
62.5%
4
40.0%