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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-6 section-1

51
Which method is most suitable for detecting groundwater table?
Discuss
Answer & Solution
Answer: Option C
Solution:
Electrical resistivity can identify changes in moisture content, helping map the groundwater table.
52
Gravity anomaly data can be corrected for terrain effects using:
Discuss
Answer & Solution
Answer: Option A
Solution:
Bouguer correction compensates for variations in elevation and terrain to isolate true subsurface anomalies.
53
Magnetic surveys are ineffective in areas with:
Discuss
Answer & Solution
Answer: Option C
Solution:
Urban infrastructure creates cultural noise in magnetic data due to metal, pipes, and cables.
54
Which seismic method provides better detail near the surface?
Discuss
Answer & Solution
Answer: Option A
Solution:
Seismic reflection offers higher resolution and is more effective for shallow subsurface mapping.
55
What does the term 'apparent resistivity' refer to?
Discuss
Answer & Solution
Answer: Option C
Solution:
Apparent resistivity is a field-measured value affected by all layers beneath the electrodes and differs from true resistivity.
56
Electromagnetic (EM) methods are especially sensitive to:
Discuss
Answer & Solution
Answer: Option B
Solution:
EM methods detect variations in electrical conductivity, useful in mapping water, clay zones, and ore bodies.
57
Which type of waves are used in reflection seismic surveys?
Discuss
Answer & Solution
Answer: Option C
Solution:
Reflection seismic uses reflected body waves to map horizontal and dipping strata.
58
Resistivity decreases with:
Discuss
Answer & Solution
Answer: Option B
Solution:
Clay content increases conductivity due to the presence of charged particles and water, reducing resistivity.
59
Which is a non-invasive geophysical method?
Discuss
Answer & Solution
Answer: Option B
Solution:
Seismic refraction is a non-invasive method that doesn�t require physical excavation or drilling.
60
Seismic velocity is generally lowest in which of the following materials?
Discuss
Answer & Solution
Answer: Option C
Solution:
Wet clay has high moisture and low density, resulting in the slowest seismic velocities among the listed materials.