GATE GG-1 topic:earth-science PYQs & Answers — Page 61

Questions 601–610 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 61 of 65

Match the geophysical terms in Group-I with their corresponding units of measurements in Group-II.

Group-I P. Transit time Q. Conductivity R. Gravity anomaly S. Magnetic field intensity

Group-II

mGal

nanoTesla

siemens

millivolt

microsecond per feet

Your answerChoose one option.

P-5; Q-4; R-2; S-1

P-5; Q-4; R-3; S-2

P-5; Q-3; R-1; S-2

P-4; Q-3; R-2; S-1

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The Maxwell’s equation based on Ampere’s law is

Your answerChoose one option.

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The normal gravity formula (for e.g. GRS80) is a function of

Your answerChoose one option.

geocentric latitude.

geodetic latitude.

longitude.

altitude.

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A seismic refraction survey was carried out over a subsurface consisting of a stack of horizontal isotropic layers. In the common midpoint (CMP) domain, the moveout (traveltime v/s offset) curve for any primary reflection event is best approximated by

Your answerChoose one option.

an ellipse.

a parabola.

a circle.

a hyperbola.

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Assertion (a): Magnetic stripes are observed around mid-oceanic ridge regions. Reason (r): The earth’s magnetic field undergoes reversals of polarity.

Your answerChoose one option.

(a) is true but (r) is false.

(a) is false but (r) is true.

Both (a) and (r) are true and (r) is one of the correct reasons for (a).

Both (a) and (r) are true but (r) is not the correct reason for (a).

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A seismic gap refers to a

Your answerChoose one option.

time gap between two great earthquakes.

distance gap between the epicenters of two great earthquakes.

segment of an active belt where a historical great earthquake has not occured.

wide gap in the earth created by a great earthquake.

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The travel time difference between the arrival times of a shear wave (S) and primary wave (P) observed on a seismogram recorded at an epicentral distance of 100km from a near surface earthquake is __________ s. (Assume the average P and S wave velocities to be 6.0 km/s and 3.5 km/s, respectively).

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The percentage increase in P-wave velocity (km/s) across the Mohorovicic discontinuity from the lower crust to the upper mantle beneath a craton is approximately ______________ (%).

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Which one amongst the following logging tools has the largest depth of investigation?

Your answerChoose one option.

Density

Laterolog 3

Laterolog 8

Neutron

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The most abundant radioactive isotope in the continental crust is

Your answerChoose one option.

⁴⁰K

²³²Th

²³⁵U

²³⁸U

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GATE GG-1 topic:earth-science PYQs

Question 16

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Question 25