Geology and Geophysics
GATE GG-1 Principles and applications of gravity, magnetic, electrical, electromagnetic, seismic and radiometric methods of prospecting for oil, mineral and ground water; introductory well logging PYQs
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How to practice Principles and applications of gravity, magnetic, electrical, electromagnetic, seismic and radiometric methods of prospecting for oil, mineral and ground water; introductory well logging
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 36. Imported answers require independent review unless marked reviewed.
Question 12
Open questionGGMCQ1 markNeeds review
Which one of the following logging tools is used to measure the diameter of a borehole?
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The given figure depicts an array used in DC resistivity surveys, where the current electrodes are denoted by C1 and C2, and potential electrodes by P1 and P2. If all the electrodes are equally spaced, then the given array corresponds to which one of the following configurations?
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Open questionGGMCQ2 marksNeeds review
Match the geophysical methods in Group–I with their associated physical properties in Group–II.
Group–I
P. Magnetic
Q. Gravity
R. Magnetotelluric
S. Induced Polarization
Group–II
Chargeability
Electrical conductivity
Susceptibility
Density
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A current of 2 A passes through a cylindrical rod with uniform cross-sectional area of 4 m² and resistivity of 100 Ω-m. The magnitude of the electric field (E) measured along the length of the rod in V/m is ______________ (in integer).
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Variation of Bouguer anomaly obtained along a profile after applying all the necessary corrections is due to
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In a seismic reflection survey over a two-layered Earth model having densities and seismic velocities ρ₁=2000 kg/m³, V₁=1800 m/s for the first layer and ρ₂=3000 kg/m³, V₂=2100 m/s for the second layer, the normal incidence P-wave reflection coefficient is ______________. [round off to 3 decimal places]
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Let us consider that a student misses canceling the self-potential between potential electrodes before injecting current into the subsurface, in a Wenner electrical resistivity survey using DC resistivity meter over a horizontally stratified Earth. In direct and reverse modes of measurement (when current flows from C1 to C2 and C2 to C1, respectively) with the same magnitude of current flow, the potential differences recorded are +158 mV and −214 mV, respectively. The self-potential between the potential electrodes before injecting current was ________mV. [in integer]
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In a multi-electrode resistivity tomography (ERT) survey, using equally spaced electrodes, which of the given configurations will provide the maximum number of data points?
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In Electromagnetic methods of prospecting, which one of the given options is CORRECT about frequency and type of current source for the Primary field used?
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Low value in SP log as observed in dispersed shales is mainly due to the impeded movement of:
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