GATE GG-1 topic:geology PYQs & Answers — Page 12

Questions 111–120 of 650. Imported answers require independent review unless marked reviewed.

What is the value of the maximum shear stress in a rock, for which the state of stress is given by the following Mohr circle?

Diagram for Geology and Geophysics question 46

Your answerChoose one option.

20 MPa

40 MPa

50 MPa

60 MPa

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In a hypothetical scenario, the element Y has 4 stable isotopes

Y and

Y. The isotope

Y is radiogenic and is formed by β

decay of the isotope

X of the element X with a half-life of 3.51 billion years. An igneous rock, which has behaved as a closed system, has three different minerals P, Q, and R, which crystallized from the same magma 2 billion years ago, with initial X/Y ratios of 1.75, 2.05, and 0.75, respectively. Which one of the following statements is true for the ratio

Y in this igneous rock in the present day?

Your answerChoose one option.

P > Q > R

R > P > Q

Q > P > R

Q > R > P

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Which one of the following factors governs the inclination of the slip face (leeward side) of ripples?

Your answerChoose one option.

Velocity of the transporting medium

Sediment supply

Internal friction angle

Drag force

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High intensity rainfall in the Higher Himalayan region causes extensive damage, because of its large droplet size. Which one of the following relationships between the kinetic energy of raindrop (E) and droplet diameter (D) explains this process?

Your answerChoose one option.

E ∝ D

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The units A to H marked on the figure represent different rock formations. Select the option that describes the chronological sequence from old to young.

Diagram for Geology and Geophysics question 50

Your answerChoose one option.

F, E, D, G, C, B, A, H

F, E, D, C, B, A, G, H

F, E, D, G, C, H, B, A

F, E, D, H, G, C, B, A

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In the IUGS classification diagram for mafic and ultramafic rocks shown below, choose the correct option for the rocks labeled X and Y.

Diagram for Geology and Geophysics question 51

Your answerChoose one option.

X: Harzburgite and Y: Olivine Websterite

X: Iherzolite and Y: Olivine Websterite

X: Dunite and Y: Clinopyroxenite

X: Anorthosite and Y: Wehrlite

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Choose the correct combination of minerals (listed in Group A) with the corresponding locations of their deposits (listed in Group B).

Group-A	Group-B
M. Magnesite	1. Bikaner
N. Uranite	2. Nausahi
O. Clay minerals	3. Salem
P. Platinum group elements	4. Jaguda

Your answerChoose one option.

M-1; N-2; O-3; P-4

M-4; N-3; O-2; P-1

M-3; N-4; O-1; P-2

M-2; N-4; O-1; P-3

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Choose the explanation(s) for negative Eu anomalies in upper crustal rocks like granite and granodiorite.

Your answerSelect all correct options. You can choose more than one.

These rocks are end-products of magmatic differentiation

These rocks were formed by melting of the mantle, which was already depleted in Eu

Most of the Eu was incorporated in other minerals

The melt residues contain plagioclase which are enriched in Eu

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Which characteristic feature(s) best explain(s) the HIMU mantle reservoir?

Your answerSelect all correct options. You can choose more than one.

Magmas derived from this reservoir have high

and

Magmas derived from this reservoir have high

and

This reservoir has evolved with high Th/U

This reservoir has evolved with high U/Pb

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Choose the correct option(s) related to tectonic settings and associated rock types.

Your answerSelect all correct options. You can choose more than one.

Tholeiitic basalts and alkali basalts are both associated with mid-oceanic ridges

Andesites are commonly found in convergent plate boundaries

Tholeiitic basalts and alkali basalts can both be associated with plume-related volcanism

Volcanic rocks from subduction zones have high volatile content

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GATE GG-1 topic:geology PYQs

Question 46

Question 47

Question 48

Question 49

Question 50

Question 51

Question 52

Question 53

Question 54

Question 55