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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-4 section-1

Each section contains 100 MCQs on Site Investigation and Geotechnical Exploration .
31
What is the primary purpose of conducting a geotechnical site investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
The main goal of a geotechnical site investigation is to assess subsurface conditions such as soil properties, groundwater, and rock profiles for safe and efficient engineering design.
32
The Standard Penetration Test (SPT) is performed using which sampler?
Discuss
Answer & Solution
Answer: Option C
Solution:
The SPT uses a split-spoon sampler driven into the soil by a hammer, and the number of blows for each 30 cm is recorded as the "N-value".
33
What is the main advantage of geophysical methods in site investigations?
Discuss
Answer & Solution
Answer: Option C
Solution:
Geophysical methods like seismic or resistivity surveys allow non-invasive, wide-area coverage for subsurface profiling, especially in preliminary investigations.
34
Which of the following is NOT a direct method of soil exploration?
Discuss
Answer & Solution
Answer: Option C
Solution:
Electrical resistivity is a geophysical (indirect) method, while the others involve physically reaching and retrieving subsurface materials.
35
The N-value obtained in an SPT gives an indication of:
Discuss
Answer & Solution
Answer: Option C
Solution:
The N-value from an SPT gives a measure of relative density in granular soils and can also indicate strength in cohesive soils.
36
Which type of boring is best suited for obtaining undisturbed samples?
Discuss
Answer & Solution
Answer: Option C
Solution:
Rotary drilling with a core barrel enables the retrieval of undisturbed samples of rock and sometimes stiff soils, ideal for strength tests.
37
What is the minimum number of boreholes recommended for a rectangular building site?
Discuss
Answer & Solution
Answer: Option C
Solution:
For a rectangular structure, at least four boreholes�one at each corner�are recommended to accurately profile subsurface variability.
38
Which method is commonly used for shallow soil investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
Test pits are excavated to a depth of a few meters to visually inspect soil layers, collect samples, and perform field tests.
39
What does a piezometer measure in a soil profile?
Discuss
Answer & Solution
Answer: Option B
Solution:
A piezometer is an instrument inserted into boreholes to measure groundwater levels or pore water pressure, critical for slope and foundation design.
40
Which of the following is a dynamic penetration test?
Discuss
Answer & Solution
Answer: Option B
Solution:
The SPT is a dynamic test where a hammer is used to drive the sampler into the soil and record blow counts.