GATE GG-1 format:nat PYQs & Answers — Page 13 — Exam Papers

Questions 121–130 of 155. Imported answers require independent review unless marked reviewed.

Topic practice 155 questionsPage 13 of 16

A cylindrical core of granite with a radius of 25 mm was subjected to point load test. The load was applied parallel to the diameter of the core and the failure load was 20 kN. The uncorrected point load strength index is ________ MPa.

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A hypothetical garnet peridotite composed of 60% olivine, 25% orthopyroxene, 10% clinopyroxene and 5% garnet undergoes 10% batch melting described by

where F is degree of melting and D is bulk partition coefficient. The ratio of Ce in the melt to the original rock will be ________. (round off to 2 decimal places). (The K_D values of Ce for olivine, orthopyroxene, clinopyroxene and garnet are 0.01, 0.003, 0.10 and 0.02, respectively)

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⁸⁷Rb decays to ⁸⁷Sr with a decay constant λ = 1.42 × 10⁻¹¹ per year. If at the time of formation, a system contains 8 × 10⁴ atoms of ⁸⁷Rb and 10³ atoms of ⁸⁷Sr, the number of ⁸⁷Sr atoms in this system at the end of 4 half-lives will be ________ × 10³. Assume close system evolution for parent-daughter pair.

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Assume a flat earth with crustal thickness of 35 km and average crustal and upper mantle P-wave velocities of 6.4 km s

and 8.1 km s

, respectively. The minimum distance from the epicenter of a near surface earthquake at which Pₙ-waves are observed is ________ km.

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Given that the velocity of P-waves in a sandstone matrix is 5600 m/s and that in oil is 1200 m/s, the velocity of P-wave propagation in oil saturated sandstone with 30% porosity is ________ m/s. (Use Wyllie time average equation.)

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If the total porosity of a soil is 20%, its void ratio (%) is ________.

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During bench blasting in a quarry, 50 kg of an explosive with a yield of 5 MegaJoule/kg is required to break 100 m

of marble. In this case, the energy expended in breaking a unit volume of marble in MegaNewton/m

would be ____________.

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The stretch lineation on the axial plane (S

) of a reclined fold on the S

foliation makes an angle of 30° with the S

/S

intersection lineation. The rake of the stretching lineation on the axial plane in degrees is ____________.

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A basic magma has an initial nickel concentration of 300 ppm. Olivine crystals from this magma by equilibrium crystallization (Case I) or fractional crystallization (Case II). Then, the absolute value of the difference between the nickel concentrations of the liquids remaining after 25% crystallization in these two cases is ____________. (Use K

olivine-melt = 10).

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The difference in the number of faces in forms and in the holosymmetric class of the isometric system is ____________.

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