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Geophysical Methods in Engineering MCQs Questions & Answers | Geological Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Geophysical Methods in Engineering. These resources are available for Geological engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Geophysical Methods in Engineering chapter is particularly important for students studying Geological engineering. Page-4 section-1

31
What is the main limitation of Ground Penetrating Radar (GPR)?
Discuss
Answer & Solution
Answer: Option D
Solution:
GPR struggles in highly conductive soils like clays due to rapid signal attenuation.It performs best in dry, sandy, or resistive environments.
32
In which method are current electrodes used to introduce electric current into the ground?
Discuss
Answer & Solution
Answer: Option C
Solution:
Electrical resistivity methods inject current into the ground through electrodes to measure the potential difference and infer subsurface resistivity.
33
What does a low resistivity value usually indicate?
Discuss
Answer & Solution
Answer: Option C
Solution:
Clay and saturated soils conduct electricity well, thus showing low resistivity.High resistivity is typical of dry, dense rocks.
34
Which method can detect voids or sinkholes beneath roads?
Discuss
Answer & Solution
Answer: Option D
Solution:
Resistivity imaging can detect anomalies caused by voids, cavities, or sinkholes as these areas contrast with surrounding material in resistivity.
35
Which parameter is derived from magnetic surveys?
Discuss
Answer & Solution
Answer: Option C
Solution:
Magnetic intensity reflects the total field strength and is used to detect magnetic anomalies due to ferromagnetic materials underground.
36
What is the primary use of gravity methods in engineering geology?
Discuss
Answer & Solution
Answer: Option C
Solution:
Gravity methods detect changes in subsurface density which helps locate voids, faults, and rock interfaces.
37
What kind of waves are Rayleigh waves?
Discuss
Answer & Solution
Answer: Option A
Solution:
Rayleigh waves are a type of surface seismic wave that travel along Earth's surface and are useful in shallow geophysical surveys.
38
Which geophysical method is most suitable for detecting metallic ore bodies?
Discuss
Answer & Solution
Answer: Option C
Solution:
Magnetic surveys are highly effective in detecting metallic ores with magnetic properties like magnetite or pyrrhotite.
39
Which configuration provides higher resolution in shallow resistivity surveys?
Discuss
Answer & Solution
Answer: Option A
Solution:
The dipole-dipole array offers excellent resolution for mapping shallow lateral variations in subsurface resistivity.
40
In seismic methods, which factor influences wave velocity the most?
Discuss
Answer & Solution
Answer: Option C
Solution:
Seismic wave velocity depends primarily on the density and elastic modulus of the material through which the wave travels.