GATE GG-1 Earth and planetary system PYQs & Answers — Page 5

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Questions 41–48 of 48. Imported answers require independent review unless marked reviewed.

Topic practice 48 questionsPage 5 of 5

Assume a flat earth with crustal thickness of 35 km and average crustal and upper mantle P-wave velocities of 6.4 km s

and 8.1 km s

, respectively. The minimum distance from the epicenter of a near surface earthquake at which Pₙ-waves are observed is ________ km.

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Which one of the following oceanic ridges is known to be aseismic?

Your answerChoose one option.

Carlsberg

Mid Atlantic

Ninety East

Southwest Indian

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Isogonic lines are contours of equal magnetic

Your answerChoose one option.

inclination.

declination.

total field intensity.

horizontal field intensity.

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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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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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GATE GG-1 Earth and planetary system PYQs

Question 23

Question 14

Question 15

Question 18

Question 20

Question 21

Question 22

Question 23