GATE GG-1 Hydrogeology PYQs & Answers

Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.

Questions 1–10 of 13. Imported answers require independent review unless marked reviewed.

Topic practice 13 questionsPage 1 of 2

An aquifer has a surface area of 100 km². With no recharge, assume that pumping out 2 × 10⁷ m³ of ground water resulted in a drop of the water table by 6 m. If the aquifer has a specific retention of 15 %, then the porosity of the aquifer is _____ % (rounded off to one decimal place).

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Which one of the following expressions represents porosity of a rock?

Your answerChoose one option.

(Solid volume − Pore volume) / Solid volume

(Bulk volume − Pore volume) / Bulk volume

(Bulk volume − Solid volume) / Solid volume

(Bulk volume − Solid volume) / Bulk volume

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A confined aquifer with a uniform saturated thickness of 10 m has hydraulic conductivity of 10⁻² cm/s. Considering a steady flow, the transmissivity of the aquifer in m²/day is _________________ (rounded off to one decimal place).

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A soil mass comprises two horizontal layers (of equal thickness and equal width) stacked one above the other. The hydraulic conductivities of the two layers are 5 × 10⁻² cm/s and 3 × 10⁻² cm/s. Considering Darcian flow of water and same hydraulic gradient for both the layers, the effective hydraulic conductivity of the soil mass in cm/s is __________ (rounded off to two decimal places).

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The resistivity of a rock, 100% saturated with water of resistivity 0.25 Ωm, is 60 Ωm. Assuming tortuosity and cementation exponents to be 1 and 2, respectively, the porosity of the rock is _________ (in %). [round off to 2 decimal places]

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A cylindrical soil sample of 10 cm diameter is tested in a constant-head permeameter. A volume of 250 cm³ of water is collected in 5 minutes when the constant-head difference between tapping points 15 cm apart is 5 cm. Considering Darcy flow, the absolute value of coefficient of permeability in cm/s is __________. (

) [round off to 3 decimal places]

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For a productive alluvial aquifer with hydraulic conductivity = 105 m/day and hydraulic gradient = 0.01, the flow rate is ________ m/day. [round off to 2 decimal places]

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With regard to occurrence of groundwater in an area, which of the given statements is CORRECT?

Your answerChoose one option.

Vadose water occurs in the zone of saturation.

The zone of aeration lies below the zone of saturation.

The water table marks the uppermost surface of the vadose zone.

The depth of the perched water table is less than that of the water table.

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A stratified confined aquifer consists of three parallel homogeneous and isotropic horizontal layers with thickness of 10 m, 5 m and 5 m. The layers have the same width. The hydraulic conductivities of the strata are 15 m/day, 20 m/day and 30 m/day, respectively. The water flow follows Darcy's law and is parallel to the strata. Considering the same hydraulic gradient for all the layers, the effective hydraulic conductivity of the aquifer is ________ m/day. [in integer]

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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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GATE GG-1 Hydrogeology PYQs

How to practice Hydrogeology

Question 65

Question 31

Question 25

Question 65

Question 24

Question 63

Question 17

Question 35

Question 48

Question 29