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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-9 section-1

81
The seismic velocity of a rock is primarily controlled by:
Discuss
Answer & Solution
Answer: Option B
Solution:
Seismic velocity depends on the density and elastic moduli (Young�s and bulk modulus) of the material.
82
What does a high-resistivity anomaly usually indicate?
Discuss
Answer & Solution
Answer: Option C
Solution:
A high-resistivity anomaly often indicates dry, compact, or resistive materials like granite or dense limestone.
83
The tool used to record seismic waves is called:
Discuss
Answer & Solution
Answer: Option C
Solution:
A geophone is an instrument that converts ground motion into voltage, used to detect seismic waves.
84
In seismic methods, what does travel time refer to?
Discuss
Answer & Solution
Answer: Option C
Solution:
Travel time is the time taken by a seismic wave to travel from the source to the detector.It�s used to calculate depth and velocity.
85
What is the role of the base station in a magnetic survey?
Discuss
Answer & Solution
Answer: Option C
Solution:
In magnetic surveys, a base station records diurnal changes in the Earth's magnetic field for correction of mobile station data.
86
Which array provides better depth penetration in resistivity surveys?
Discuss
Answer & Solution
Answer: Option C
Solution:
Schlumberger arrays offer greater depth penetration due to wider spacing between current electrodes.
87
What is the purpose of a Bouguer correction in gravity surveys?
Discuss
Answer & Solution
Answer: Option B
Solution:
Bouguer correction adjusts gravity readings to a common elevation datum, removing effects of height.
88
A gravimeter measures:
Discuss
Answer & Solution
Answer: Option C
Solution:
A gravimeter is a sensitive instrument that measures small variations in gravitational acceleration.
89
What is the typical unit of magnetic field strength used in magnetic surveys?
Discuss
Answer & Solution
Answer: Option A
Solution:
Magnetic field strength is often expressed in nanoTesla (nT) or Tesla.1 Tesla = 10,000 Gauss.
90
What does a resistivity sounding curve show?
Discuss
Answer & Solution
Answer: Option B
Solution:
A resistivity sounding curve plots apparent resistivity vs electrode spacing, used to interpret subsurface layering.