Geology and Geophysics
GATE GG-1 year:2021 PYQs
Build your understanding with focused practice from past exam papers.
Questions 61–65 of 65. Imported answers require independent review unless marked reviewed.
Question 51
Open questionGG - G1NAT2 marksNeeds review
The heat flux at the Earth’s surface is 60 mWm⁻². If the thermal conductivity at the surface is 2.5 Wm⁻¹ °C⁻¹, the geothermal gradient is ________ °C/km. [in integer]
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A rock formed at time t₀ = 0 with number of ¹⁴C atoms = 10⁵. The number of ¹⁴C atoms (in log₁₀) after a time of 8×10³ years is ________. [round off to 3 decimal places] (Use a decay constant of 1.25 × 10⁻⁴ yr⁻¹)
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In the given reaction,
2Fe²⁺ + 3H₂O → Fe₂O₃ + 6H⁺ + 2e⁻
consider ideal condition, take concentration of Fe²⁺ as 10⁻⁵ mol, E⁰ = 0.98 V and pH=6. The value of (2.303 × R × T)/F = 0.059 (where F is the Faraday constant). The value of Eₕ on the Fe²⁺ / hematite boundary at 25 °C is __________ V. [round off to 2 decimal places]
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The first and second dissociation constants of H₂CO₃ are 6.71 × 10⁻⁷ and 4.68 × 10⁻¹¹, respectively. If the concentration of H₂CO₃ is 1 mol and pH = 6, the ∑CO₂ in the solution (assuming ideal condition) is ______ mol. [round off to 3 decimal places]
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A satellite orbits the earth at an altitude of 700 km on the equatorial plane of the earth and it revolves in the same direction as the direction of rotation of the earth. Considering the radius of a spherical earth as 6300 km and the acceleration due to gravity as 10 m/s², the tangential velocity of the satellite in the orbit is ______ km/s. [round off to 2 decimal places]
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