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CBSE Questions for Class 7 Chemistry Water A Precious Resource Quiz 2 - MCQExams.com
CBSE
Class 7 Chemistry
Water A Precious Resource
Quiz 2
Water day celebrates every year to attract the attention of everybody towards the importance of conserving water.
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True
0%
False
Explanation
On World Water Day, the importance of water is celebrated and the awareness is also spread that the majority of the population does not have proper access to safe water.
Therefore, the given statement is true.
A larger number of people drawn water from the natural sources. Which of the following are natural resources?
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Dam
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River
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Lake
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Glacier
Explanation
A larger number of people draw water from natural sources such as rivers, lakes, and glaciers. Therefore, Options B, C, and D are correct.
Water scarcity also threatens the lives of wild animals across country.
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True
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False
Explanation
Water scarcity also threatens the lives of wild animals across the country. They also struggle a lot in shortage of water and dies in extreme cases. Therefore, the given statement is true.
In which of the following activities water is used?
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Drinking
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Cooking
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Bathing
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Sleeping
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Agriculture
Explanation
There are numerous activities which we perform in daily life and water plays an important role in them. Options A, B, C, and E are correct.
Oceans play an important role in supplying the water that we use.
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True
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False
Explanation
Most of the water that we use comes from rains and water that trickles into the ground as groundwater. The water that evaporates from oceans is a major source of rainwater.
In a few years from now more than one third of the people in the world could face water scarcity.
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True
0%
False
Explanation
It is estimated that in a few years from now more than one third of the people in the world could face water scarcity. Therefore, the given statement is true.
Water that moves over the surface of the ground into lakes and rivers is called
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ground water
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a water table
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run-off
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the water cycle
Explanation
The run-off process leads water towards lakes and rivers.
Option C is correct.
Study the figure below showing the components of water cycle represented by P, Q, R, S, T.
Which of the following can be harnessed to conserve rain water?
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Q, S
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P, Q
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P, S
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S, T
Explanation
Only run-off ($$Q$$) part of the precipitated ($$P$$) water can be harnessed to conserve rainwater.
Option $$B$$ is correct.
The main source of water for rivers is in the form of :
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Lakes
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Rain water
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Snow
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Dams
________ is the major source of fresh water.
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Groundwater
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Sea-water
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Lake
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None of the above
Explanation
Groundwater and surface waters are the major sources of fresh water in India. Groundwater is the water present beneath the earth's surface which can be extracted in various ways.
Water harvesting is done by ____________ processes.
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rainwater
0%
groundwater
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both A and B
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atmospheric water
Explanation
Water Harvesting
It means storing rain where it falls or storing the run off in your own village or town. And taking measures to keep that water clean by not allowing polluting activities to take place in our locality.
It can be done by two major processes:
1. Rainwater harvesting
It is a method of collection and storage of rainwater
into natural reservoirs or tanks or the infiltration of surface water into subsurface aquifers.
2. Groundwater harvesting
Groundwater harvesting is a method to save water placed under the ground to control the groundwater flow in an aquifer and to raise the water table.
Which of the following water sources is used for drinking purposes?
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Sea water
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Glaciers
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Ground water
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None of these
Explanation
Groundwater is, in general, easier and cheaper to treat than surface water, because it tends to be less polluted and hence used for drinking purposes.
Sea-water contains dissolved salt in it, hence it is not generally used for drinking purposes as it's very difficult to purify. Water stored in the form of glaciers mostly gets dissolved into seawater after melting rendering it unfit for drinking.
Hence, the answer is C.
Which of the following is the most important factor in balancing the amount of fresh water on earth?
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Water cycle
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Green house effect
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Wastewater treatment plants
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Transpiration
Explanation
Out of all the options, option $$\text{A}$$ is correct as water cycle is the most important factor in balancing the amount of fresh water on earth.
The percentage of water in a human body is:
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80%
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70%
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60%
0%
50%
Explanation
The percentage of water in the human body is $$70\%$$.
Different parts of the body contain different percentages of water and the average $$\approx 70\%$$.
Which of the following is not a way to conserve water?
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Replace
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Reduce
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Reuse
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Recycle
Explanation
Replace is not a way to conserve water.
Following are the three ways to conserve water:
Reduce: Use only as much water as you need. Dont waste water.
Reuse: Water which is left after washing the vegetables and cloths should be used for mopping.
Recycle: Sewage and effluents should be treated before being flown into rivers or ponds.
The main source of water for inland lakes is:
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snow
0%
sea water
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ground water
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None of these
Explanation
Inland lakes are naturally occurring water bodies. The main source of water for inland lakes is groundwater.
Groundwater is water present beneath the earth's surface in soil spaces and the fractures of rock.
Groundwater is an example of a/an:
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non-renewable resource
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exhaustable resource
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renewable resource
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degradable resource
Explanation
The resources which renew themselves over time are termed renewable resources.
After a heavy shower, most of the water percolated into the ground through pores on the surface and recharges the groundwater level. But the rate of recharging of groundwater is slower than the rate at which it is being used up. If proper measures are not taken to save groundwater, it might soon become a non-renewable resource.
So, technically groundwater is a renewable resource, but the process of recharging groundwater is pretty slow.
Water does not contain mineral salts of:
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sodium
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gold
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calcium
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magnesium
Explanation
The principal ions found in water are calcium, magnesium, sodium, bicarbonate, sulfate, chloride and nitrate. A few parts per million of iron or manganese may sometimes be present and there may be traces of potassium salts, whose behaviour is very similar to that of sodium salts.
State true or false.
Well water is an example of surface water.
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True
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False
Explanation
Well water is an example of underground water. Wells are formed by digging and drilling to access water present in underground aquifers.
Hence, given statement is $$False$$.
How can we conserve water?
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Turn off the water while brushing your teeth.
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Take shorter showers.
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Water your lawn only when it needs it.
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All of the above are correct.
Explanation
Water is the most important element for the preservation of life. Water is a finite commodity that, if not managed properly, will result in shortages soon. Water conservation can go a long way to help alleviate these impending shortages.
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