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Groundwater and Hydrogeology MCQs Questions & Answers | Geological Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Groundwater and Hydrogeology. These resources are available for Geological engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Groundwater and Hydrogeology chapter is particularly important for students studying Geological engineering. Page-3 section-1

Each section contains 100 MCQs on Groundwater and Hydrogeology .
21
What does a cone of depression represent in hydrogeology?
Discuss
Answer & Solution
Answer: Option C
Solution:
A cone of depression forms when water is drawn from a well, creating a lowered water table around the well.It reflects the drawdown effect of pumping.
22
Which type of aquifer yields water only when it is below the water table?
Discuss
Answer & Solution
Answer: Option C
Solution:
An unconfined aquifer is directly recharged by infiltration and stores water above an impermeable base with its upper surface being the water table.
23
Hydraulic conductivity is dependent on:
Discuss
Answer & Solution
Answer: Option C
Solution:
Hydraulic conductivity describes how easily water can move through a soil or rock and depends on the pore structure and fluid properties.
24
What is the unit of transmissivity?
Discuss
Answer & Solution
Answer: Option A
Solution:
Transmissivity is the product of hydraulic conductivity and aquifer thickness.It is expressed in m�/day or similar area per time units.
25
Which factor decreases the permeability of an aquifer?
Discuss
Answer & Solution
Answer: Option B
Solution:
Cementation reduces permeability by filling pore spaces with precipitated minerals, thus reducing the interconnected voids needed for fluid flow.
26
In groundwater hydrology, what is meant by the term �drawdown�?
Discuss
Answer & Solution
Answer: Option C
Solution:
Drawdown is the difference between the static and pumping water level in a well due to extraction.It helps assess aquifer response to pumping.
27
Which geophysical method is commonly used to map groundwater zones?
Discuss
Answer & Solution
Answer: Option B
Solution:
The resistivity method detects variations in subsurface electrical resistivity to locate water-bearing formations, as saturated rocks conduct electricity better.
28
Which parameter indicates the total volume of water that can be stored in an aquifer per unit surface area?
Discuss
Answer & Solution
Answer: Option A
Solution:
Storage coefficient is the volume of water released or stored per unit surface area per unit change in hydraulic head, especially important in confined aquifers.
29
What is the term for the slow movement of water through pores in soil or rock?
Discuss
Answer & Solution
Answer: Option B
Solution:
Seepage is the gradual movement of water through porous materials, important in both natural flow and dam safety evaluations.
30
A confined aquifer releases water due to:
Discuss
Answer & Solution
Answer: Option A
Solution:
In a confined aquifer, water is under pressure, and when tapped by a well, it rises due to pressure difference, sometimes even flowing to the surface without pumping.