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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-2 section-1

Each section contains 100 MCQs on Site Investigation and Geotechnical Exploration .
11
Which parameter is NOT directly assessed in a geotechnical investigation?
Discuss
Answer & Solution
Answer: Option B
Solution:
Soil fertility relates to agriculture and is not relevant to geotechnical design.Investigations focus on strength, compressibility, and permeability.
12
What is the role of a piezometer in site investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
A piezometer is used to measure pore water pressure or groundwater level in soils.It plays a vital role in slope stability and seepage analysis.
13
What does disturbed soil sample mean?
Discuss
Answer & Solution
Answer: Option D
Solution:
A disturbed sample has lost its original fabric or structure during collection.It is suitable for index tests but not strength or compressibility tests.
14
The SPT hammer weight and free fall height are respectively:
Discuss
Answer & Solution
Answer: Option A
Solution:
The SPT uses a 63.5 kg hammer falling from a height of 76 cm to drive the sampler.This standard ensures consistency across tests.
15
Which one is NOT a primary phase in a typical site investigation?
Discuss
Answer & Solution
Answer: Option D
Solution:
Landscaping is part of construction aesthetics, not investigation.Site investigation includes desk study, fieldwork, sampling, and lab testing.
16
Which of the following equipment is used to determine in-situ vane shear strength of soft clays?
Discuss
Answer & Solution
Answer: Option B
Solution:
The field vane shear apparatus measures the in-situ shear strength of very soft to soft cohesive soils without disturbance.It is widely used for clayey deposits.
17
Which method is best suited for sampling granular soils without disturbance?
Discuss
Answer & Solution
Answer: Option C
Solution:
A piston sampler allows sampling with minimal disturbance, especially in granular and saturated soils, by controlling suction and avoiding soil fall.
18
The spacing of boreholes in a detailed geotechnical investigation for a building is usually:
Discuss
Answer & Solution
Answer: Option B
Solution:
In detailed investigations, borehole spacing is kept close (5-15 m) to provide accurate subsurface information under the structure footprint.
19
Which test is typically performed to determine coefficient of permeability in the field?
Discuss
Answer & Solution
Answer: Option D
Solution:
A pumping test involves pumping water from a well and observing the drawdown.It helps determine the coefficient of permeability of aquifers and soils.
20
The presence of boulders in soil is best detected using:
Discuss
Answer & Solution
Answer: Option A
Solution:
Electrical resistivity detects subsurface anomalies like boulders, cavities, and water tables by measuring changes in electrical conductivity.