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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-7 section-1

Each section contains 100 MCQs on Site Investigation and Geotechnical Exploration .
61
What is the main purpose of geotechnical exploration?
Discuss
Answer & Solution
Answer: Option C
Solution:
The goal of geotechnical exploration is to determine subsurface soil and rock properties, groundwater conditions, and assess suitability for proposed construction.
62
What does the term "undisturbed sample" mean in geotechnical investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
An undisturbed sample maintains the natural structure and water content of the soil, crucial for laboratory analysis of strength, permeability, and compressibility.
63
Which technique is best for mapping shallow subsurface features like sinkholes?
Discuss
Answer & Solution
Answer: Option B
Solution:
Electrical resistivity can detect anomalies such as voids, fractures, and sinkholes by measuring how current flows through the subsurface.
64
What is typically the first step in a site investigation process?
Discuss
Answer & Solution
Answer: Option C
Solution:
The first step is always a desk study and site reconnaissance to gather existing geological data and assess the site visually.
65
Which type of boring is preferred in cohesive soils for sampling?
Discuss
Answer & Solution
Answer: Option C
Solution:
Auger boring is ideal for soft to medium cohesive soils and allows relatively quick and low-cost sampling.
66
In SPT, what does "N-value" represent?
Discuss
Answer & Solution
Answer: Option B
Solution:
The N-value in Standard Penetration Test represents the number of blows needed to drive the split spoon sampler 30 cm, indicating soil strength.
67
The main reason for performing laboratory soil tests after field sampling is to:
Discuss
Answer & Solution
Answer: Option C
Solution:
Laboratory tests are essential to assess engineering properties like permeability, shear strength, and compressibility, which influence design decisions.
68
Which of the following does NOT belong to in-situ tests?
Discuss
Answer & Solution
Answer: Option C
Solution:
The triaxial test is conducted in the lab, while the others are in-situ (field) tests done directly at the site.
69
Ground Penetrating Radar (GPR) works by:
Discuss
Answer & Solution
Answer: Option C
Solution:
GPR sends high-frequency electromagnetic waves into the ground and captures reflections from subsurface objects or changes in material.
70
Why is groundwater table depth important in geotechnical investigation?
Discuss
Answer & Solution
Answer: Option D
Solution:
Groundwater depth significantly affects foundation design, slope stability, and settlement, especially for fine-grained soils.