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 & Answers — Page 2

Questions 11–20 of 36. Imported answers require independent review unless marked reviewed.

In Radiometric survey, the g-ray spectrometer count rate depends on:

Your answerChoose one option.

Cracks present in the target rock volume

Solid angle of the target rock about the spectrometer

Temperature in the target rock

Pressure in the target rock

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In reduction of gravity data, the latitude correction is maximum at:

Your answerChoose one option.

35° latitude

45° latitude

55° latitude

65° latitude

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Normal moveout (NMO) for reflected phase of seismic data is 2 milliseconds. Consider the diffraction source at the edge of the same reflector, where the shot point is directly above diffraction source. In this case, the NMO due to diffraction is ______ milliseconds [in integer].

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In a 2D seismic survey, first receiver location is at (1000 m, 400 m), second receiver location is at (2000 m, 400 m) and the source location is at (2000 m, 1000 m). Consider P-wave velocity as 5000 m/sec. The difference in first arrival time of P-wave phase for the two receivers is ______ seconds. [round off to 2 decimal places].

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The potential difference measured between potential electrodes using Wenner array is 500 mV when a current of 2 A is passed through the subsurface between current electrodes. If the computed apparent resistivity is 100 Ωm then the distance between the current electrodes will be ______ m. [round off to 2 decimal places] (Use π = 3.14)

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There are indications of presence of a massive tabular multimetal sulfide ore body at a shallow depth from the surface. Which of the following would be the most efficient geophysical method to confirm the presence of the ore body?

Your answerChoose one option.

resistivity sounding

ground geomagnetic survey

self-potential method of geophysical prospecting

ground gravity survey

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Which one of the following pair of geophysical methods is most suitable to delineate chromite ore deposits occurring at a shallow depth in granitic terrain?

Your answerChoose one option.

Gravity and Electrical methods

Electrical and Electromagnetic methods

Seismic and Gravity methods

Seismic and Magnetic methods

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During ‘K-capture’ nuclear transmutation process

Your answerChoose one option.

both atomic number and atomic mass increase

atomic number decreases but atomic mass remains the same

atomic number increases but atomic mass remains the same

both atomic number and atomic mass decrease

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Which one amongst the following logs has the maximum depth of investigation?

Your answerChoose one option.

Neutron log

Natural Gamma-ray log

Later log

Density log

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Nuclide A decays to nuclide B exclusively through α and β decay, such that the mass number is reduced by 32 and the atomic number is reduced by 10. The number of β particles emitted during the decay of nuclide A to nuclide B is ______.

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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

Question 9

Question 14

Question 23

Question 24

Question 25

Question 36

Question 8

Question 15

Question 16

Question 19