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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-8 section-1

71
The magnetometer is an instrument used to:
Discuss
Answer & Solution
Answer: Option C
Solution:
A magnetometer measures Earth�s magnetic field strength, crucial for detecting subsurface magnetic anomalies.
72
The Schlumberger and Wenner arrays are used in which geophysical method?
Discuss
Answer & Solution
Answer: Option C
Solution:
Both Schlumberger and Wenner arrays are electrode configurations used in resistivity methods for subsurface profiling.
73
In geophysics, what is an anomaly?
Discuss
Answer & Solution
Answer: Option B
Solution:
A geophysical anomaly is a deviation from the expected background value and may indicate subsurface changes like faults, ore bodies, or cavities.
74
Electrical resistivity of a material is influenced by:
Discuss
Answer & Solution
Answer: Option B
Solution:
Water content reduces resistivity because water (especially with dissolved salts) increases conductivity.
75
What is the main advantage of geophysical methods in site investigation?
Discuss
Answer & Solution
Answer: Option C
Solution:
Geophysical methods are generally non-invasive, rapid, and cost-effective for preliminary subsurface investigations without excavation.
76
What is the main principle behind seismic reflection methods?
Discuss
Answer & Solution
Answer: Option C
Solution:
Seismic reflection works on the principle that seismic waves reflect off subsurface boundaries between layers of different acoustic impedance.It is widely used for detailed imaging.
77
In which situation is electrical resistivity method least effective?
Discuss
Answer & Solution
Answer: Option D
Solution:
Electrical resistivity is least effective in clay-rich soils due to high conductivity and poor resolution.
78
Seismic methods are typically classified into:
Discuss
Answer & Solution
Answer: Option A
Solution:
Seismic methods are divided into active (controlled source) and passive (natural source) based on the source of seismic energy.
79
Which of the following does NOT influence electrical resistivity?
Discuss
Answer & Solution
Answer: Option D
Solution:
Magnetic field does not influence resistivity directly.Resistivity is mainly affected by moisture content, porosity, and temperature.
80
Gravity anomalies help in identifying:
Discuss
Answer & Solution
Answer: Option D
Solution:
Gravity anomalies are caused by density contrasts in subsurface materials and are useful for identifying buried features.