Geology and Geophysics
GATE GG-1 year:2023 PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.
Question 21
Open questionGGMSQ2 marksNeeds review
Which of the given folds is/are represented by the stereoplot?
Your answerSelect all correct options. You can choose more than one.
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The bulk density and water content of a soil are 1800 kg/m³ and 18%, respectively. The dry density of the soil calculated from the given information is ____________ kg/m³. [round off to 2 decimal places]
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In a seismic reflection survey over a two-layered Earth model having densities and seismic velocities ρ₁=2000 kg/m³, V₁=1800 m/s for the first layer and ρ₂=3000 kg/m³, V₂=2100 m/s for the second layer, the normal incidence P-wave reflection coefficient is ______________. [round off to 3 decimal places]
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The resistivity of a rock, 100% saturated with water of resistivity 0.25 Ωm, is 60 Ωm. Assuming tortuosity and cementation exponents to be 1 and 2, respectively, the porosity of the rock is _________ (in %). [round off to 2 decimal places]
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Let us consider that a student misses canceling the self-potential between potential electrodes before injecting current into the subsurface, in a Wenner electrical resistivity survey using DC resistivity meter over a horizontally stratified Earth. In direct and reverse modes of measurement (when current flows from C1 to C2 and C2 to C1, respectively) with the same magnitude of current flow, the potential differences recorded are +158 mV and −214 mV, respectively. The self-potential between the potential electrodes before injecting current was ________mV. [in integer]
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For the given figure, considering Pratt’s model of isostatic compensation at the crust mantle boundary, the crustal density (ρ₁) that explains 1.5 km deep lake is ____________ kg/m³. (Consider density of water ρw = 1000 kg/m³) [round off to 2 decimal places]
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Open questionGGMCQ1 markNeeds review
Which one of the following mineral pair shows solid solubility through coupled substitution of elements?
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The behavior of trace elements in magmatic systems follows
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Choose the CORECT statement regarding crystallization of a single feldspar of composition Or₅₀Ab₅₀ in the Albite-Orthoclase system.
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Given ΔVᵣ and ΔSᵣ are the volume and entropy of reaction, respectively, the most suitable conditions for the reaction to be used as a geothermometer are
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