Geology and Geophysics
GATE GG-1 format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 51–60 of 422. Imported answers require independent review unless marked reviewed.
Question 30
Open questionGGMCQ1 markNeeds review
Shown below is a schematic plot of
(deviation of
in a sample relative to CHUR) versus time. The two solid lines represent the evolution curves for the depleted mantle reservoir and the continental crust. Which one of the four dashed lines, marked 1, 2, 3, and 4, represents the evolution of the CHUR? 
Your answerChoose one option.
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Which one of the following expressions represents porosity of a rock?
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Choose the correct option where both organisms do NOT secrete any CaCO₃ (calcite or aragonite).
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From the following optical properties of minerals, select an appropriate option to identify the direction of analyser and polarizer if the available microscope is without a cross-hair.
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Which one of the following minerals has crystallographic axes
and all interaxial angles equal to 90°?Your answerChoose one option.
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Which one of the following statements correctly describes the features in the geological map?
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In which one of the following rivers does helical flow play an important role in controlling river dynamics and channel morphology?
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Open questionGGMCQ2 marksNeeds review
A particular Index of Alteration (IA) is defined as the molar concentration ratio (expressed as weight percentage) of fluid immobile element(s) to fluid mobile element(s) and is expressed by 100 × ([Al
O
] / ). For chemical weathering of silicate rocks, which one of the following statements is correct?Your answerChoose one option.
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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?
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Open questionGGMCQ2 marksNeeds review
In a hypothetical scenario, the element Y has 4 stable isotopes
Y,
Y,
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/
Y in this igneous rock in the present day?Your answerChoose one option.
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