GATE Geophysics online test paper 3
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Question 1 of 17
Königsberger ratio refers toCorrect
Question 2 of 17
The Poisson’s relation linking the gravity and magnetic potentials assumes the same anomaly source withCorrect
Question 3 of 17
Arrange the following electrode configurations in the ascending order of their depth of investigation
Question 4 of 17
Which one of the following transforms relates the real and imaginary components of harmonic electromagnetic (EM) field?Correct
Question 5 of 17
Which one of the following geophysical methods is most suitable for exploration of possible hydrocarbon-bearing sediments underlying the Deccan Traps?Correct
Question 6 of 17
A collection of traces having a common mid-point is called a CMP gather. The number of traces in an n-fold survey in a CMP gather isCorrect
Question 7 of 17
In seismic prospecting, migration is the process of moving data elements fromCorrect
Question 8 of 17
An 80 Hz seismic signal is sampled at a rate of 100 samples/s. What will be its aliased period (in seconds) in the sampled signal?Correct
Question 9 of 17
The Fourier transform and integral of the Dirac delta function respectively areCorrect
Question 10 of 17
Calculate the formation water saturation, Sw from the following well log data:
Resistivity of completely saturated formation, Ro = 1.8 Ω-m
True resistivity of formation, Rt = 25 Ω-mCorrect
Question 11 of 17
Consider the four systems of algebraic equations (listed in Group I). The systems (Q), (R) and (S) are obtained from (P) by restricting the accuracy of data or coefficients or both respectively, to two decimal places.
Match these systems to their characteristics (listed in Group II)
Group I Group II
(P) x+ 1.0000y = 2.0000
x+1.0001y = 2.0001
(Q) x+ 1.0000y = 2.00
x+1.0001y = 2.00
(R) x+ 1.00y = 2.0000
x+1.00y = 2.0001
(S) x+ 1.00y = 2.00
x+1.00y = 2.00
Question 12 of 17
The amplitude spectrum of a band pass filter, AB, can be obtained by a combination of spectra of a low pass filter, AL, and that of a high pass filter, AH, asCorrect
Question 13 of 17
Given the potential field anomaly data at the datum level z=0, match the spatial frequency expressions (listed in Group I) with the corresponding operations (listed in Group II).(k is wave number)
(Q) k exp(−zk)
(S) k exp(zk)
(1) Second vertical derivative at the datum level
(2) Analytic continuation into upper half-space
(3) Analytic continuation into lower half-space
(4) First vertical derivative of upward continued values
(5) First vertical derivative of downward continued valuesCorrect
Question 14 of 17
Assertion (a): An efficient marine seismic survey should use an implosive source.
Reason (r): The performance of a marine seismic source is rated by high pulse-to-bubble ratio.Correct
Question 15 of 17
Depth migration is applied to a stacked seismic section. Compared to the stacked section, dipping events in the migrated sectionCorrect
Question 16 of 17
A monochromatic elastic wave of frequency 20 Hz propagates in a medium with average velocity 3 km/s. For zero offset reflection from horizontal reflectors, the thickness of the vertical first Fresnel zone is ________ m.Correct
Question 17 of 17
Which one of the following resistivity sounding curves exhibits both ‘Equivalence’ and ‘Suppression’ type ambiguities in interpretation of data?Correct