GATE GG-1 kind:question PYQs & Answers — Page 36 — Exam Papers

Questions 351–360 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 36 of 65

A vertical borehole encounters a shale bed of uniform thickness occurring at a depth of 5 m and dipping 60°. The borehole pierces through this shale bed for a length of 10 m to reach a sandstone layer below. The true thickness of the shale bed is ______ m. [in integer]

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The mass and volume of a fully dried soil sample are 220 gm and 1100 cm³, respectively. If the specific gravity of the soil particles is 2.5 and water density is 1 gm/cm³, the void ratio of the soil is ________. [round off to 2 decimal places]

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A constant-head permeability test was performed on a vertical sand column of height 40 cm and cross-sectional area of 25 cm². During the test, when the loss of head was 50 cm, the volume of water collected in 2 minutes was 300 cm³. Applying Darcy’s law, the calculated coefficient of permeability of the sand column is ______ cm/sec. [round off to 2 decimal places]

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The radius (r) of the oblate spheroid at 45° latitude with ellipticity of polar flattening of 1/298.25 and equatorial radius of 6378140 m is ______ km. [round off to 2 decimal places]

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Light passes through two media with refractive indices of 1.75 and 1.55, respectively. The thickness of both the media is 30 μm. The resultant path difference of the yellow light component (λ = 589 nm) is ______ μm. (Take π = 3.141) [round off to one decimal places]

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The water table in an unconfined aquifer at a place near the coast is 1 m above the Mean Sea Level. Given the densities of fresh and saline water as 1.001 and 1.025 g/cc, respectively, the fresh-saline water interface at the same location should be at a depth of ______ m from the water table. [round off to one decimal place]

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The volume percentage of galena and quartz in an ore body of Pb are 90 and 10, respectively. The densities of galena and quartz are 7.6 and 2.65 g/cc, respectively. The grade of the ore body in terms of weight percent of Pb is _____. (Atomic weights of Pb = 206 and S = 32) [round off to 2 decimal places]

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Normal moveout (NMO) for reflected phase of seismic data is 2 milliseconds. Consider the diffraction source at the edge of the same reflector, where the shot point is directly above diffraction source. In this case, the NMO due to diffraction is ______ milliseconds [in integer].

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In a 2D seismic survey, first receiver location is at (1000 m, 400 m), second receiver location is at (2000 m, 400 m) and the source location is at (2000 m, 1000 m). Consider P-wave velocity as 5000 m/sec. The difference in first arrival time of P-wave phase for the two receivers is ______ seconds. [round off to 2 decimal places].

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The potential difference measured between potential electrodes using Wenner array is 500 mV when a current of 2 A is passed through the subsurface between current electrodes. If the computed apparent resistivity is 100 Ωm then the distance between the current electrodes will be ______ m. [round off to 2 decimal places] (Use π = 3.14)

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