Geology and Geophysics
GATE GG-1 format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–30 of 422. Imported answers require independent review unless marked reviewed.
Question 30
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Which one of the following is NOT a diagnostic parameter in identifying a crystalline phase using powder X-ray diffraction data?
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If a dextral strike-slip fault system has a right step-over, which one of the following features will develop?
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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?
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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 |
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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
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Which one of the following chrons of Neogene and Quaternary geomagnetic polarity time scale is arranged in the order from oldest to youngest?
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Match the mineral names in Group I with corresponding space groups in Group II.
Group-I: P. Diamond; Q. Coesite; R. Graphite; S. Calcite.
Group-II: 1. P6₃/mmc; 2. R3̅c; 3. Fd3̅m; 4. C2/c
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