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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-3 section-1

Each section contains 100 MCQs on Site Investigation and Geotechnical Exploration .
21
What is the main limitation of wash boring?
Discuss
Answer & Solution
Answer: Option C
Solution:
Wash boring is not effective in hard or boulder-rich formations because the water jet cannot penetrate rock easily.It is mostly used in soft to medium soils.
22
Which device is commonly used to collect rock cores during drilling?
Discuss
Answer & Solution
Answer: Option C
Solution:
A core barrel is a cylindrical tool used in rotary drilling to collect intact rock cores for analysis of strength and structure.
23
What does the term "depth of exploration" refer to?
Discuss
Answer & Solution
Answer: Option C
Solution:
Depth of exploration is the depth to which subsurface conditions are examined to ensure safe design and construction of foundations.
24
What is the typical recovery ratio for an undisturbed soil sample?
Discuss
Answer & Solution
Answer: Option D
Solution:
An ideal recovery ratio is near 100%, indicating an undisturbed sample is nearly the same length as the sampler's penetration, maintaining its structure.
25
Which of the following best describes geotechnical investigation reports?
Discuss
Answer & Solution
Answer: Option C
Solution:
A geotechnical report presents test data, interpretation, subsurface profiles, and recommendations for safe foundation design and construction planning.
26
Pressuremeter test measures:
Discuss
Answer & Solution
Answer: Option C
Solution:
The pressuremeter test measures in-situ horizontal stress, modulus of elasticity, and strength of soil and weak rock by expanding a probe laterally.
27
Which instrument helps determine depth to bedrock in geophysical surveys?
Discuss
Answer & Solution
Answer: Option A
Solution:
A resistivity meter maps subsurface layers based on electrical resistance, which varies significantly between soil and bedrock.
28
Which one of these is a static penetration test?
Discuss
Answer & Solution
Answer: Option A
Solution:
The CPT involves pressing a cone into the ground at a constant rate.It is a static penetration test used to determine soil resistance and stratigraphy.
29
Which factor most affects the reliability of soil sampling?
Discuss
Answer & Solution
Answer: Option C
Solution:
The type of sampler (disturbed vs. undisturbed) critically affects sample quality.Undisturbed samples are essential for accurate strength and compressibility testing.
30
What does the term "exploratory boring" mean?
Discuss
Answer & Solution
Answer: Option C
Solution:
Exploratory boring is drilling holes in the ground to investigate subsurface conditions such as soil layers, groundwater, and bedrock for geotechnical assessment.