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Site Investigation and Geotechnical Exploration MCQs Questions & Answers | Geological Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Site Investigation and Geotechnical Exploration. These resources are available for Geological engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Site Investigation and Geotechnical Exploration chapter is particularly important for students studying Geological engineering. Page-6 section-1

Each section contains 100 MCQs on Site Investigation and Geotechnical Exploration .
51
What does RQD stand for in geotechnical investigations?
Discuss
Answer & Solution
Answer: Option B
Solution:
RQD or Rock Quality Designation quantifies rock mass quality by measuring the percentage of intact core lengths over 10 cm from a drill run.
52
Which geophysical method measures variations in subsurface conductivity?
Discuss
Answer & Solution
Answer: Option B
Solution:
Electrical resistivity surveys detect subsurface layers based on differences in conductivity/resistivity of soil and rock.
53
A Shelby tube is typically used to obtain:
Discuss
Answer & Solution
Answer: Option B
Solution:
A Shelby tube is a thin-walled, seamless tube used to collect undisturbed samples from cohesive soils, important for lab strength and consolidation testing.
54
In seismic refraction, waves are refracted at interfaces of different:
Discuss
Answer & Solution
Answer: Option C
Solution:
Seismic refraction relies on the change in seismic wave velocities as waves pass through soil or rock layers of varying stiffness or density.
55
Which test is most appropriate for detecting loose sand layers during site investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
The SPT (Standard Penetration Test) is effective in detecting loose sand layers, indicated by low N-values (blow counts).
56
What is the function of drilling mud in rotary drilling?
Discuss
Answer & Solution
Answer: Option B
Solution:
Drilling mud acts as a coolant and lubricant while maintaining borehole stability and carrying cuttings to the surface.
57
What kind of sample is best for permeability and consolidation tests?
Discuss
Answer & Solution
Answer: Option C
Solution:
Undisturbed samples retain in-situ structure and moisture, essential for accurate permeability and consolidation tests.
58
Which device is used to measure vertical settlement during soil testing?
Discuss
Answer & Solution
Answer: Option A
Solution:
An extensometer is used to monitor settlement or deformation in vertical directions, often during consolidation or load tests.
59
During site investigation, which test is commonly used to assess groundwater depth?
Discuss
Answer & Solution
Answer: Option C
Solution:
Groundwater level is typically determined by direct observation in boreholes (recorded in a boring log).
60
The term "borehole log" refers to:
Discuss
Answer & Solution
Answer: Option C
Solution:
A borehole log contains a detailed record of soil/rock layers, groundwater levels, and sampling data encountered during drilling.