7th Grade > Chemistry
WATER A PRECIOUS RESOURCE MCQs
Total Questions : 114
| Page 2 of 12 pages
Answer: Option C. -> No, the situation will be in balance.
:
C
Water table reduces if we keep consuming groundwater. In a situation wherethe same amount of water that isbeing used gets infiltrated back to the ground naturally then the case of groundwater depletion does not arise. Hence, the situation will bein balance.
:
C
Water table reduces if we keep consuming groundwater. In a situation wherethe same amount of water that isbeing used gets infiltrated back to the ground naturally then the case of groundwater depletion does not arise. Hence, the situation will bein balance.
Answer: Option B. -> False
:
B
The regions which receive very less rainfall should involve in water harvesting because, during scarcity, people can use harvested water.
:
B
The regions which receive very less rainfall should involve in water harvesting because, during scarcity, people can use harvested water.
Answer: Option D. -> 50 litres per person per day.
:
D
The United Nations has said that every person requires about 50 litres of water every day for their daily needs such as drinking, washing, cooking and maintaining proper hygiene. Though 50 litres of water does not seem like a lot of water yet billions of people all around the world do not have access to even half of this recommended quantity. Hence, there is an immediate need for spreading awareness about the conservation of water.
:
D
The United Nations has said that every person requires about 50 litres of water every day for their daily needs such as drinking, washing, cooking and maintaining proper hygiene. Though 50 litres of water does not seem like a lot of water yet billions of people all around the world do not have access to even half of this recommended quantity. Hence, there is an immediate need for spreading awareness about the conservation of water.
Answer: Option A. -> True
:
A
As we keep digging the surface ofEarth,we will observe a level where all the spaces between the soil and rock particles is occupied by water. This water is called groundwater. Hence the above statement is correct.
:
A
As we keep digging the surface ofEarth,we will observe a level where all the spaces between the soil and rock particles is occupied by water. This water is called groundwater. Hence the above statement is correct.
Answer: Option C. -> Washing cars
:
C
Human beings need a certain amount of water for survival and maintenance of hygiene. But using this precious clean water to wash cars can be regarded as wastage of water especially during times of scarcity. We commonly see ourselves and our neighbours wasting tremendous quantities of water to wash cars which can also be cleaned using lesser quantity of water.
We should use methods which use less water. For example, we can use sprays instead of buckets to clean the car.
:
C
Human beings need a certain amount of water for survival and maintenance of hygiene. But using this precious clean water to wash cars can be regarded as wastage of water especially during times of scarcity. We commonly see ourselves and our neighbours wasting tremendous quantities of water to wash cars which can also be cleaned using lesser quantity of water.
We should use methods which use less water. For example, we can use sprays instead of buckets to clean the car.
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Statement: 1 Mark
Explanation: 2 Marks
Evaporation is a time taking process and does not happen within seconds.
The water that falls on the ground seeps through the pores on theground and goes below to form a part of the groundwater.
This process is called infiltration. Even the rainwater that falls on the ground recharges the groundwater through this process.
Some water seeps even below and forms a part of aquifers.
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Definition: 1 Mark
Methods: 2 Marks
Water conservation is a process of preventing wastage of water, using water carefully and recharging groundwater.
Water conservation can be done by:
1) Repairing leaking pipes and taps.
2) Not wasting water during brushing teeth, shaving, bathing, washing clothes and during other activities.
3) Rainwater harvesting.
4) By drip irrigation of plants.
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Each Point: 1 Mark
(i) Evaporation is a slow process by which water gets converted from the liquid state to the gaseous state. In water cycle, evaporation is an important process for the formation of water vapours. So, "Evaporation” matches with "Generation of water vapour”.
(ii) Infiltration is the process by which groundwater gets recharged, so it matches with "Recharging of groundwater”.
(iii) Condensation is the process by which water gets converted from gaseous state to liquid state. In the water cycle, condensation is responsible for the formation of clouds. So, it matches with "Formation of clouds”.
(iv) Drip irrigation is a method for conservation of water. So, it matches with it in column 2.
(v) Precipitation is responsible for the transfer of water from clouds to the ground. So, it matches with "transfer of water from the atmosphere".
![Match The Following and Justify Your Answer. [5 MARKS]Pro...](https://lakshyaeducation.in/quizpics/quiz/23420_d564c2480b914819ad881477f18d3a5801d4fb64_Capture1.PNG "Click to Enlarge Image")
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Factors: 2 Marks
The factors that help the rainwater to seep into the soil are as follows:
(i) Duration of precipitation
(ii) Type and strength of precipitation
(iii) Type of soil
(iv) The land cover, like, areas in which there aremore plants, infiltration or seeping will take place more easily
:
Explanation: 3 Marks
Diagram: 2 Marks
Water cycle is a natural cycle by which water flows across the globe, both above and below the ground. The mass of water on earth remains constant but keeps flowing from one form to another. Starting from the ocean and seas, water gets evaporated and reaches the atmosphere. There, it cools down and forms clouds. These clouds are responsible for precipitation. Rivers, ponds and surface water is derived mainly from rainwater. Rivers also get water from glaciers and snow caps. Rainwater also recharges the groundwater through infiltration. The water then travels back to the seas and oceans either through the rivers (above the ground) or through groundwater runoff (below the ground). Thus, the cycle gets completed and water keeps flowing continuously. A diagram depicting this cycle is given below,
![Explain Water Cycle with diagram. [5 MARKS]](https://lakshyaeducation.in/quizpics/quiz/content_water_cycle.jpg "Click to Enlarge Image")
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