51. What does RQD stand for in geotechnical investigations?
52. Which geophysical method measures variations in subsurface conductivity?
53. A Shelby tube is typically used to obtain:
54. In seismic refraction, waves are refracted at interfaces of different:
55. Which test is most appropriate for detecting loose sand layers during site investigation?
56. What is the function of drilling mud in rotary drilling?
57. What kind of sample is best for permeability and consolidation tests?
58. Which device is used to measure vertical settlement during soil testing?
59. During site investigation, which test is commonly used to assess groundwater depth?
60. The term "borehole log" refers to:
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