Free Practice Quiz Question List

5 Groundwater Online Quiz Questions

Use this free practice quiz with 20 questions to review 5 Groundwater, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

Which description best identifies an aquifer?

A
A layer that prevents all groundwater movement between geologic units
B
Saturated rock or sediment that can store and transmit enough water to supply wells or springs
C
Any rock containing pores, regardless of whether water can move through it
D
The boundary between the saturated and unsaturated zones

Fill in the blank

1 point

Recharge adds water to groundwater storage when water reaches the .

True or false

1 point

In an unconfined aquifer, the water table can rise or fall as recharge and discharge change.

A
True
B
False

Choose one

1 point

A well penetrates a confined aquifer. What does the level to which water rises in the well represent?

A
It shows the depth of the bottom of the aquifer.
B
It always shows the local water table.
C
It reflects the aquifer's pressure and may be above the aquifer itself.
D
It shows the elevation at which recharge entered the aquifer.

Written response

1 point

What property describes the proportion of a soil or rock material's volume that is made up of openings?

Choose all

1 point

Which processes can add water to groundwater storage? Select all that apply.

A
Rain or snowmelt that percolates down to the saturated zone
B
Water taken up by plants before it reaches the saturated zone
C
Water leaking from a river, lake, or wetland into the ground
D
Irrigation or managed recharge that delivers water to the saturated zone

Fill in the blank

1 point

Groundwater generally moves from higher hydraulic head toward hydraulic head.

True or false

1 point

In a water-table well, the resting water level indicates the local water table.

A
True
B
False

Choose all

1 point

A well pumps groundwater near a river that normally gains groundwater. Which outcomes can pumping cause? Select all that apply.

A
Lower groundwater head near the well
B
Reduce groundwater flow to the river
C
Always increase groundwater discharge to the river
D
Induce river water to seep into the aquifer

Written response

1 point

What is the term for the groundwater contribution to a river that is especially important between rainstorms?

Choose one

1 point

After rain, water infiltrates a permeable surface, but some returns to the atmosphere before reaching the water table. Which conclusion is best supported?

A
Any water that enters the soil immediately raises the water table.
B
Water that infiltrates can only become recharge if it comes from rainfall.
C
Infiltration guarantees that water reaches an aquifer, regardless of soil and climate.
D
Some infiltrated water may remain in the soil or return to the atmosphere before reaching the saturated zone.

Open ended

1 point

Compare how an unconfined aquifer and a confined aquifer release water from storage when water levels or pressure fall. Include the role of gravity in the unconfined aquifer and the role of pressure in the confined aquifer.

Choose one

1 point

Two otherwise comparable groundwater paths pass through the same aquifer material. If one has a steeper hydraulic gradient, what does Darcy's law predict about flow along that path?

A
Flow must decrease because water has less time to enter pores.
B
Flow remains unchanged because only the material controls flow.
C
Flow increases because the hydraulic gradient is steeper.
D
Flow stops because the water has reached the saturated zone.

Written response

1 point

What is the name for the roughly cone-shaped zone of drawdown created around a pumping well?

Choose one

1 point

A sediment sample has many pore spaces, but the pores connect poorly. Which conclusion best explains why it may transmit water slowly?

A
It has low porosity, so it must transmit water slowly.
B
It may have high porosity but low permeability because its pores are poorly connected.
C
It must be an aquifer because any material with many pores transmits water readily.
D
Its permeability is high because water is stored in its pores.

Written response

1 point

What term describes a river reach where groundwater flows through the bed or banks into the channel?

Choose one

1 point

A well penetrates a confined aquifer, and water rises above the top of that aquifer inside the well. What does the level to which it rises represent?

A
The depth of the aquifer's bottom
B
The local water table in every case
C
The potentiometric surface of the confined aquifer
D
The depth of the confining layer

Choose one

1 point

When water levels or pressure fall, which comparison correctly describes how unconfined and confined aquifers generally release water from storage?

A
An unconfined aquifer generally releases water as gravity drains some pore spaces; a confined aquifer releases water mainly as pressure changes slightly compress the water and aquifer materials.
B
Both types release water only when all their pore spaces drain completely.
C
A confined aquifer releases water by gravity draining its open upper surface; an unconfined aquifer releases it only through compression.
D
Neither type releases water from storage when water levels or pressure fall.

Choose one

1 point

Water seeps from a river into the ground and reaches the saturated zone. How should this transfer be classified?

A
The river is gaining because water is moving from the aquifer into the channel.
B
The water is baseflow because all water beneath a river is baseflow.
C
The water is not recharge unless it comes from rain or snowmelt.
D
The river water can recharge the aquifer if it reaches the saturated zone.

True or false

1 point

A field team finds groundwater moving through fractured bedrock but no underground channel. True or false: This observation is consistent with how groundwater commonly moves.

A
True
B
False

5 Groundwater Online Quiz Questions

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