Geology and Geophysics
GATE GG-1 topic:geology PYQs
Build your understanding with focused practice from past exam papers.
Questions 41–50 of 650. Imported answers require independent review unless marked reviewed.
Question 41
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For a chemical system with 5 phases at the invariant point, the number of possible univariant reactions in pressure-temperature space is _____ (answer in integer).
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Two tectonic plates, P and Q, move in opposite directions along a transform fault boundary. If the plate velocity of P is 8 cm/year and of Q is 6 cm/year with respect to a fixed reference frame, the relative velocity between P and Q is ________ cm/year (answer in integer).
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If the atomic mass unit of ⁸⁵Rb and ⁸⁷Rb are 84.912 and 86.901, respectively, then the abundance of ⁸⁷Rb is __________ % (rounded off to nearest integer).
[Use: Average atomic mass of Rb = 85.467 amu]
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A mineral under crossed nicols displays second order greenish-yellow (Δₘ = 740 nm) interference colour. On introduction of gypsum plate (Δₐ = 550 nm) along the length of the mineral orientation, first order grey interference colour is displayed. The net retardation is ________ nm (answer in integer).
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Which one of the following mineral reactions will result in the formation of a diagnostic granulite facies assemblage during regional metamorphism of a pelite?
Your answerChoose one option.
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The given table shows modal volume percentage of quartz, alkali feldspar and plagioclase in coarse-grained rocks, X and Y. Which of the following rock names of X and Y are CORRECT according to the IUGS classification?
Mineral | X (volume %) | Y (volume %) |
|---|---|---|
Quartz | 15 | 25 |
Plagioclase | 20 | 60 |
Alkali feldspar | 65 | 15 |
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 47
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The ternary diagram given below shows phase relations for the Anorthite-Diopside-Forsterite system at 1 bar pressure. Broken lines represent isotherms with temperature in °C. If ‘P’ is the initial melt composition, which one of the following is the CORRECT sequence of crystallization assuming equilibrium between crystal and melt?
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Accumulation of which one of the following minerals can explain positive Eu and positive Sr anomalies in the primitive mantle-normalized multielement pattern of an igneous rock?
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Match the minerals in Group I with the corresponding elements in Group II.
Group-I | Group-II |
|---|---|
P. Smithsonite | 1. Lead |
Q. Azurite | 2. Iron |
R. Crocite | 3. Zinc |
S. Marcasite | 4. Copper |
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Match the stratigraphic Formations in Group I with the corresponding Geologic Periods in Group II.
Group-I: P. Kopili Shale; Q. Ranikhet Formation; R. Quilon Formation; S. Dalmiapuram Formation.
Group-II: 1. Permian; 2. Eocene; 3. Cretaceous; 4. Miocene
Your answerChoose one option.
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