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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-10 section-1

Each section contains 100 MCQs on Site Investigation and Geotechnical Exploration .
91
What is the primary goal of a preliminary site investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
The goal of a preliminary site investigation is to collect general data about geology, hydrology, and surface conditions to plan detailed exploration effectively.
92
Which test is used to assess relative density of granular soils in the field?
Discuss
Answer & Solution
Answer: Option B
Solution:
The SPT is commonly used in field investigations to estimate relative density and compactness of granular soils like sands and gravels.
93
What equipment is used in a static cone penetration test (CPT)?
Discuss
Answer & Solution
Answer: Option C
Solution:
The cone penetrometer is hydraulically pushed into the ground to record resistance of soil layers, ideal for soft soils.
94
In-situ tests are primarily conducted to:
Discuss
Answer & Solution
Answer: Option D
Solution:
In-situ tests like SPT, CPT, and VST provide real-time soil behavior data in its undisturbed condition, unlike lab tests.
95
What is the main limitation of the standard penetration test?
Discuss
Answer & Solution
Answer: Option C
Solution:
The SPT results are affected by equipment variability, hammer energy, and operator skill, leading to inconsistencies if not standardized.
96
What is a trial pit used for?
Discuss
Answer & Solution
Answer: Option C
Solution:
A trial pit or test pit is a shallow excavation made to visually examine soil layers, often used in small-scale or preliminary investigations.
97
Which instrument helps determine lateral extent of subsurface layers without excavation?
Discuss
Answer & Solution
Answer: Option A
Solution:
A seismograph records seismic wave velocities in geophysical surveys to interpret the lateral spread of subsurface layers.
98
Which property is measured using a vane shear test?
Discuss
Answer & Solution
Answer: Option A
Solution:
The vane shear test measures the undrained shear strength of soft and sensitive clays by rotating a vane blade in the soil.
99
What is the major function of soil sampling in geotechnical investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
Soil samples are collected for lab testing and classification to assess properties like grain size, plasticity, and strength.
100
Why are disturbed samples inadequate for strength tests?
Discuss
Answer & Solution
Answer: Option B
Solution:
Disturbed samples have lost their natural fabric and in-situ condition, making them unsuitable for strength or consolidation tests.