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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-5 section-1

41
What is the key purpose of performing 2D resistivity imaging?
Discuss
Answer & Solution
Answer: Option C
Solution:
2D resistivity imaging creates cross-sectional images showing variations in resistivity with depth and lateral distance.
42
Magnetic anomalies are best observed in areas with:
Discuss
Answer & Solution
Answer: Option C
Solution:
Magnetic anomalies occur due to the presence of ferromagnetic materials like iron-rich rocks or ores.
43
What does Vertical Seismic Profiling (VSP) involve?
Discuss
Answer & Solution
Answer: Option B
Solution:
VSP involves placing receivers down a borehole while the source is on the surface to get high-resolution seismic data near the borehole.
44
What is the main objective of electrical resistivity tomography (ERT)?
Discuss
Answer & Solution
Answer: Option C
Solution:
ERT is a geophysical imaging method that creates 2D or 3D models of the resistivity distribution underground.
45
The Bouguer correction in gravity surveys accounts for:
Discuss
Answer & Solution
Answer: Option C
Solution:
The Bouguer correction adjusts gravity data for elevation and terrain effects to isolate true density anomalies.
46
Which geophysical method is used to measure variations in electrical potential due to subsurface features?
Discuss
Answer & Solution
Answer: Option A
Solution:
Self-potential (SP) measures natural electric potentials in the ground.It�s useful in identifying ore bodies, groundwater flow, and geothermal zones.
47
The travel time of seismic waves is primarily used to determine:
Discuss
Answer & Solution
Answer: Option B
Solution:
Seismic travel time helps in mapping subsurface lithology by identifying boundaries based on changes in wave velocity.
48
What is the typical unit of magnetic field strength used in geophysical exploration?
Discuss
Answer & Solution
Answer: Option B
Solution:
Magnetic field strength is usually expressed in Gauss or nanoTesla (nT), especially in exploration work.
49
The resolution of Ground Penetrating Radar depends on:
Discuss
Answer & Solution
Answer: Option A
Solution:
GPR resolution improves with higher antenna frequency, though it reduces penetration depth.
50
What is the depth of investigation in resistivity methods most influenced by?
Discuss
Answer & Solution
Answer: Option B
Solution:
The electrode spacing directly influences how deep the resistivity current penetrates the subsurface.