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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-7 section-1

61
Which geophysical method is best suited for locating buried metallic objects?
Discuss
Answer & Solution
Answer: Option A
Solution:
Electromagnetic (EM) methods are ideal for detecting buried metal objects due to their sensitivity to conductive materials.They respond to the changes in induced electromagnetic fields around metals.
62
The unit of gravitational acceleration used in gravity surveys is:
Discuss
Answer & Solution
Answer: Option B
Solution:
In geophysics, gravity is often measured in Gals or milliGals (mGal).1 Gal = 1 cm/s�.
63
Which geophysical method measures variations in the Earth�s gravitational field?
Discuss
Answer & Solution
Answer: Option C
Solution:
The gravity method detects density contrasts by measuring gravitational field variations.Useful in mapping voids, faults, and buried features.
64
Which of the following is a limitation of Ground Penetrating Radar (GPR)?
Discuss
Answer & Solution
Answer: Option C
Solution:
GPR does not work well in clay-rich or highly conductive soils as signal attenuation is high.
65
What does VES stand for in electrical resistivity surveys?
Discuss
Answer & Solution
Answer: Option C
Solution:
VES (Vertical Electrical Sounding) is a technique to determine layer resistivity with depth by varying electrode spacing.
66
Which method is most commonly used for detecting cavities or sinkholes?
Discuss
Answer & Solution
Answer: Option B
Solution:
Electrical resistivity surveys can detect low-resistivity zones that represent voids or sinkholes in the subsurface.
67
Which parameter does a magnetic survey primarily measure?
Discuss
Answer & Solution
Answer: Option C
Solution:
Magnetic surveys measure magnetic susceptibility and anomalies caused by subsurface ferromagnetic minerals.
68
A sharp decrease in resistivity in a resistivity profile often indicates:
Discuss
Answer & Solution
Answer: Option C
Solution:
Saturated clay conducts electricity better, hence exhibits low resistivity in geoelectrical surveys.
69
Which of the following best describes �refraction� in seismic studies?
Discuss
Answer & Solution
Answer: Option A
Solution:
Refraction occurs when seismic waves travel across layers of differing velocity, causing bending or redirection.
70
Gravity anomalies caused by low-density features are:
Discuss
Answer & Solution
Answer: Option B
Solution:
Negative gravity anomalies occur in low-density regions like voids, alluvium, or cavities.