Geology and Geophysics
GATE GG-1 year:2017 PYQs
Build your understanding with focused practice from past exam papers.
Questions 31–40 of 65. Imported answers require independent review unless marked reviewed.
Question 31
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A limb of a non-plunging fold with an attitude 070°, 40°S is rotated about its fold axis 30° clockwise (looking towards ENE). The plunge amount of the pole to the fold limb after rotation is _____ degrees.
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The Bulk Silicate Earth (BSE) is best approximated by the average
Your answerChoose one option.
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Which one of the following is the stable mineral assemblage in metamorphism of a rock with pelitic bulk composition under granulite facies?
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The given P–T diagram shows four distinct metamorphic paths designated as 1, 2, 3 and 4. Which one of these P–T paths represents crustal thickening in a collisional tectonic setting?
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The pressure on a rock overlain by a 7 km thick basaltic crust (ρ = 3100 kg m⁻³) is __________ kilobar.
(Use g = 9.8 m s⁻²; 10⁵ Pa = 1 bar)
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The given T–X diagram shows the phase relations in olivine solid solution at 1 bar pressure. If ‘P’ is the initial position of melt, the proportion of melt at 1500°C is ________ %.
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Fluorite crystal (CaF₂) adopts face-centered cubic structure with lattice parameter a = 5.463 Å. If the ionic radius of anion (F⁻) is 1.71 Å, the ionic radius of cation (Ca²⁺) is __________ Å.
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The diagram below shows the interference figure of a mineral. The mineral is
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The standard thermodynamic data for enstatite (Mg₂Si₂O₆), quartz (SiO₂) and forsterite (Mg₂SiO₄) is given in the table below. The Gibb’s free energy of the reaction Mg₂SiO₄ + SiO₂ = Mg₂Si₂O₆ at 600 K and 1 bar is __________ J.
(Assume Cₚ = 0 for all minerals in the reaction)
Mineral | ΔH°f, 298 (kJ) | S° (J K⁻¹) |
|---|---|---|
Enstatite | -3090.47 | 132.5 |
Quartz | -910.83 | 41.5 |
Forsterite | -2172.2 | 95.1 |
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The modal abundance in an ultramafic rock and the partition coefficients of lutetium (Lu) in clinopyroxene, orthopyroxene, olivine and plagioclase are tabulated below. The bulk distribution coefficient of lutetium (D̄Lu) in the ultramafic rock is __________.
Mineral | Modal abundance (%) | Partition coefficient |
|---|---|---|
Clinopyroxene | 45 | 0.506 |
Orthopyroxene | 40 | 0.42 |
Olivine | 10 | 0.045 |
Plagioclase | 05 | 0.019 |
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