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- Question 1 of 17
##### 1. Question

Königsberger ratio refers to

CorrectIncorrect - Question 2 of 17
##### 2. Question

The Poisson’s relation linking the gravity and magnetic potentials assumes the same anomaly source with

CorrectIncorrect - Question 3 of 17
##### 3. Question

Arrange the following electrode configurations in the ascending order of their depth of investigation

(P) Dipole-Dipole

(Q) Schlumberger

(R) Wenner

(S) Pole-PoleCorrectIncorrect - Question 4 of 17
##### 4. Question

Which one of the following transforms relates the real and imaginary components of harmonic electromagnetic (EM) field?

CorrectIncorrect - Question 5 of 17
##### 5. Question

Which one of the following geophysical methods is most suitable for exploration of possible hydrocarbon-bearing sediments underlying the Deccan Traps?

CorrectIncorrect - Question 6 of 17
##### 6. Question

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 is

CorrectIncorrect - Question 7 of 17
##### 7. Question

In seismic prospecting, migration is the process of moving data elements from

CorrectIncorrect - Question 8 of 17
##### 8. Question

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?

CorrectIncorrect - Question 9 of 17
##### 9. Question

The Fourier transform and integral of the Dirac delta function respectively are

CorrectIncorrect - Question 10 of 17
##### 10. Question

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-mCorrectIncorrect - Question 11 of 17
##### 11. Question

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

(1) instability

(Q) x+ 1.0000y = 2.00

x+1.0001y = 2.00

(2) inconsistency

(R) x+ 1.00y = 2.0000

x+1.00y = 2.0001

(3) non-uniqueness

(S) x+ 1.00y = 2.00

x+1.00y = 2.00

(4) exactCorrectIncorrect - Question 12 of 17
##### 12. Question

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, as

CorrectIncorrect - Question 13 of 17
##### 13. Question

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)

Group I

(P) exp(−zk)

(Q) k exp(−zk)

(R) k*k

(S) k exp(zk)

Group II

(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 valuesCorrectIncorrect - Question 14 of 17
##### 14. Question

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.CorrectIncorrect - Question 15 of 17
##### 15. Question

Depth migration is applied to a stacked seismic section. Compared to the stacked section, dipping events in the migrated section

CorrectIncorrect - Question 16 of 17
##### 16. Question

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.

CorrectIncorrect - Question 17 of 17
##### 17. Question

Which one of the following resistivity sounding curves exhibits both ‘Equivalence’ and ‘Suppression’ type ambiguities in interpretation of data?

CorrectIncorrect