GATE GG-1 year:2025 PYQs & Answers — Page 6

Questions 51–60 of 65. Imported answers require independent review unless marked reviewed.

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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Which of the following options is/are correct for movement of warm-base glaciers?

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

Movement is dominated by basal sliding

Internal deformation involving slippage within and between ice crystals leads to glacial movement

Internal deformation is governed by shear stress following Power Law

Vertical profile of glacier flow velocity is maximum at the base and decreases upwards

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Choose the correct option(s) that describe(s) the properties of clay minerals.

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

Kaolinite is two-layered

Illite is two-layered

Montmorillonite is two-layered

Montmorillonite swells in contact with water

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Which of the following statements is/are correct for electromagnetic (EM) radiation?

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

At room temperature, natural objects emit EM radiation

Blackbody radiation is proportional to square of the absolute temperature of the body

Wien’s displacement law provides the dominant wavelength of EM emission

EM energy decreases with increase in wavelength

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Which of the following options can be linked to rise in CO₂ concentration in the atmosphere?

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

Rise in seawater pH and sea surface temperature

Decrease in seawater pH and increase in bicarbonate ion concentration in seawater

Warming of surface ocean water and decrease in bicarbonate ion concentration in seawater

Decrease in seawater pH and decrease in bicarbonate ion concentration in seawater

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A sediment core of 4 cm diameter and 35.81 cm height was collected. This core had an initial weight of 1000.00 g and upon drying the sediment, the weight decreased by 133.75 g. This core has a void ratio of 0.4257, where void ratio is defined as the ratio of volume of void to the volume of solid (Vᵥ/Vₛ). The average density of the sediment in the core is _____ g/cm³.

(Round off to two decimal places)

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GATE GG-1 year:2025 PYQs

Question 51

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Question 53

Question 54

Question 55

Question 56

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Question 59

Question 60