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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-9 section-1

Each section contains 100 MCQs on Site Investigation and Geotechnical Exploration .
81
What is the main use of a piezometer in geotechnical investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
A piezometer measures pore water pressure in soil or rock, which is crucial for slope stability and foundation design.
82
Which factor is most critical in selecting a boring method?
Discuss
Answer & Solution
Answer: Option C
Solution:
The choice of boring method depends on soil type, rock hardness, depth, and purpose of the investigation.
83
What is the main limitation of the auger boring method?
Discuss
Answer & Solution
Answer: Option C
Solution:
Auger boring is limited to shallow depths and is ineffective in very hard or boulder-rich soils.
84
What is the purpose of performing a plate load test?
Discuss
Answer & Solution
Answer: Option B
Solution:
The plate load test assesses soil bearing capacity and settlement characteristics under simulated loading.
85
Which sampling technique preserves the in-situ condition of soft clay best?
Discuss
Answer & Solution
Answer: Option C
Solution:
A Shelby tube provides undisturbed samples ideal for strength and consolidation tests in soft clay.
86
What information does the RQD value provide?
Discuss
Answer & Solution
Answer: Option C
Solution:
Rock Quality Designation (RQD) is a measure of rock mass integrity based on the percentage of solid core lengths longer than 10 cm.
87
What is an exploratory trench used for?
Discuss
Answer & Solution
Answer: Option C
Solution:
Exploratory trenches are used to visually inspect shallow geological features, faults, and layering across a section.
88
When is dynamic cone penetration test preferred?
Discuss
Answer & Solution
Answer: Option B
Solution:
The DCPT is suitable for granular soils like sand and gravel and gives quick results about penetration resistance.
89
Which geophysical method uses sound waves to map subsurface layers?
Discuss
Answer & Solution
Answer: Option C
Solution:
Seismic refraction uses sound waves that travel through different subsurface layers, helping to identify rock or water table levels.
90
What is the main disadvantage of geophysical surveys in dense urban areas?
Discuss
Answer & Solution
Answer: Option C
Solution:
In urban areas, geophysical readings may be distorted due to noise, vibrations, and utility interference, reducing accuracy.