GATE GG-1 format:nat PYQs & Answers — Page 12 — Exam Papers

Questions 111–120 of 155. Imported answers require independent review unless marked reviewed.

Topic practice 155 questionsPage 12 of 16

A confined aquifer has a uniform area (‘A’) perpendicular to the water flow. The hydraulic gradient and coefficient of permeability are given as 0.05 and 2 m/day, respectively. The total daily flow of water is 250 m³. Using Darcy’s law, the calculated value of ‘A’ is __________ m².

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The apparent dip amount of a sandstone bed is 45°. The angle between the true dip direction and the apparent dip direction is 60°. The true dip amount of the bed is __________ degree (°). (Round off to 2 decimal places)

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Assuming Airy isostatic compensation, the depth to the Moho from a point located 2 km above the mean sea level is ______ km. (round off to 1 decimal place). (The depth of compensation T for the crust at mean sea level is 30 km, the density of crust and upper mantle are 2.67 gm/cc and 3.30 gm/cc, respectively).

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On Survey of India Toposheet number 45

, the distance between two points is 18 cm. The actual ground distance between these two points is ______km.

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For a dam site investigation, drilling was carried out up to a depth of 20 m. The total length of recovered core pieces, each over 100 mm, add up to 16 m. The Rock Quality Designation (RQD) of the foundation rock mass is ______%.

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Given that

, the

is ______

(round off to 1 decimal place).

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The shear wave velocity in an igneous rock with a density of 2.7 gm/cc and rigidity modulus of 24.3 GPa is ______ km/s. (round off to 1 decimal place).

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Hydrogeological setup of a hypothetical alluvial area (where contact X-Y between two sands is vertical) is given in the schematic section. Hydraulic heads are indicated as h1, h2 and hydraulic conductivities as K1 and K2. The hydraulic head at the contact (X-Y) is ________ m. (round off to 2 decimal places).

Diagram for Geology and Geophysics question 50

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The normalized longitudinal profile of a river is given below. The Concavity Index of the river is ________ %.

Diagram for Geology and Geophysics question 51

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For producing 1 kg of gold from an ore having an assay of 2 ppm Au, ________ × 10³ kg of ore needs to be processed.

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