Tag: groundwater and depletion of water table

Questions Related to groundwater and depletion of water table

Deplaction of the water table is due to which of the following resion?

social science water: a precious resource water table groundwater and depletion of water table the water cycle

  1. insufficient rain fall

  2. industrial activities

  3. excess of tube wells

  4. all of them

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Correct Option: D
Explanation:

All the given reasons as insufficient rainfall, industrial activities and excessive use of ground water are responsible for the depletion of water table. 

The water table is:

social science water: a precious resource water table groundwater and depletion of water table the water cycle

  1. the upper level of an underground surface in which the soil or rocks are permanently saturated with water.

  2. the upper level of an underground surface in which the soil or rocks are unsaturated with water.

  3. the lower level of an underground surface in which the soil or rocks are permanently saturated with water.

  4. the lower level of an underground surface in which the soil or rocks are unsaturated with water.

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Correct Option: A
Explanation:

The water table is also known as ground water table in which water seeps into the ground and move downward till it reaches the stage of saturation. The velocity at which water flows underground depends on the permeability of the rocks.

The water table fluctuates:

social science water: a precious resource water table groundwater and depletion of water table the water cycle

  1. by climatic variations

  2. by the amount of precipitation used by vegetation

  3. by withdrawing excessive amounts of water from wells

  4. all of them

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Correct Option: D
Explanation:

The water table is also known as ground water table in which water seeps into the ground and move downward till it reaches the stage of saturation hence it fluctuates by changes in seasons, precipitation or by withdrawing a large amount of water. 

Which of the following does not cause a depletion in the water table of a place?

social science water: a precious resource water table groundwater and depletion of water table the water cycle

  1. Constructing factories and houses

  2. Making concrete roads and floors

  3. Deforestation

  4. None of these

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Correct Option: D
Explanation:

All the three options cause depletion in water table in a place as first and second case consume water and third case decrease water retention of soil and also decrease rainfall.

So, none of these is the correct option.                     

What happens to the water table of a place having droughts for a long period of time?

social science water: a precious resource water table groundwater and depletion of water table the water cycle

  1. It gets higher because of continuous evaporation and flow.

  2. It gets lower because of continuous evaporation and flow

  3. It gets replenished continuously

  4. can't say anything

Show answer
Correct Option: B
Explanation:

The water table is also called as groundwater table. It's recharge depend on the recharge from infiltration of precipitation so when a drought hit the land surface it affects the water level below ground. This result in falling groundwater level due to evaporation and flow.

So, the correct option is 'it gets lower due to continuous evaporation and flow'.

A man digging the ground near a water body found that the soil was moist.As he kept digging deeper and deeper he reached a level where all the spaces between particles of soil and gaps between rocks were filled with water. The upper limit of this layer is called:

social science water: a precious resource water table groundwater and depletion of water table the water cycle

  1. water level

  2. ground water

  3. water table

  4. water limit

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Correct Option: C
Explanation:

The upper limit of this layer where water is present between particles of soil and gaps between rocks is called water table and water below the layer is called groundwater.

The process of seeping out water into the ground is called:

social science water: a natural resource water table groundwater and depletion of water table the water cycle

  1. evaporation

  2. infiltration

  3. transpiration

  4. None of these

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Correct Option: B
Explanation:

The process of seeping out water into the ground is known as infiltration.

 It is process by which water goes into the ground resulting in increase in water table.
The process is not evaporation as it means evaporating the water present on the ground. 
The process is not transpiration as it is the process by which moisture is carried through plants from roots to small pores on the underside of leaves.

Groundwater accumulates between the layer of hard rocks. It is known as:

social science water: a natural resource water table groundwater and depletion of water table the water cycle

  1. pond

  2. water table

  3. surface water

  4. aquifer

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Correct Option: D
Explanation:

Ground water accumulator between the layer of hard rocks (water bearing permeable rock, rock fractures). It is known as aquifer.

At places, the groundwater is stored between layers of hard rock below the water table. This is known as __________.

social science water: a natural resource water table groundwater and depletion of water table the water cycle

  1. a reservoir

  2. an aquifer

  3. a hard water

  4. a well water

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Correct Option: B
Explanation:

An aquifer is an underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand or salt). Ground water can be extracted using a water well.

Water in the aquifers can be usually pumped out with the help of:

social science water: a natural resource water table groundwater and depletion of water table the water cycle

  1. handpumps

  2. drilling

  3. tubewell

  4. both $A$ and $C$

Show answer
Correct Option: D
Explanation:

When a water-bearing rock readily transmits water to wells and springs, it is called an aquifer. Wells can be drilled into the aquifers and water can be pumped out with handpump or tubewell.