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Ncert Exemplar Solutions Class 7 Science Water a Precious Resource
Welcome to NCTB Solutions. Here with this post we are going to help 7th class students for the Solutions of NCERT Exemplar Class 7 Science Book, Unit 16, Water : A Precious Resource. Here students can easily find step by step solutions of all the problems for Water : A Precious Resource, Also here our Science teacher’s are solved all the questions with easily understandable language with proper guidance so that all the students can understand easily.
Water : A Precious Resource all Question Solutions :
Multiple Choice Questions :
Question no – (1)
Which of the following does not show water shortage?
Answer :
The correct answer is option – (d)
A family gets three buckets of water per person per day.
Question no – (2)
Seas and oceans are full of water on earth. However, a very small percentage of water present on earth is available for us. This percentage is roughly
Answer :
The correct answer is option – (a)
This percentage is roughly 0.006%.
Question no – (3)
Which of the following are not the liquid forms of water?
Answer :
The appropriate answer is option – (a) (i), (iv) and (v)
Snow, Water vapour and Ice are not the liquid forms of water.
Question no – (4)
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
Answer :
The answer is option – (b)
The upper limit of this layer is called water table.
Question no – (5)
Which of the following is a way to use water economically?
Answer :
The appropriate option is – (c)
Drip irrigation is a way to use water economically.
Question no – (6)
On which of the following day is World Water Day observed?
Answer :
The correct option is – (a)
World Water Day observed on 22 March
Question no – (7)
The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene per person per day is a minimum of
Answer :
The appropriate option is – (d)
The amount of water recommended by the United Nations is 50 litres.
Question no – (8)
“Every Drop Counts” is a slogan related to
Answer :
The correct answer is option – (c)
Every Drop Counts is a slogan related to importance of water.
Question no – (9)
Water cycle does not involve which of the following?
Answer :
The appropriate option is – (d)
Rainwater harvesting does not involve in the processes of Water cycle.
Question no – (10)
Which of the following inhibits the seepage of rainwater into ground?
Answer :
The correct answer is option – (a)
A pukka floor inhibits the seepage of rainwater into ground.
Very Short Answer Questions :
Question no – (11)
Answer :
(a) Water vapour is the gaseous form of water.
This statement is True.
(b) Ice is solid whereas snow is the semi-solid form of water.
This statement is False.
Reason : Ice is solid whereas snow is also the solid form of water.
(c) Ocean water cannot be used for domestic purposes
This statement is True.
(d) Rapid growth of industries is one of the causes for water shortage.
This statement is True.
Question no – (12)
Answer :
(a) Aquifer is ground water stored between layers of hard rock above the water table.
Correct definition : Aquifer is ground water stored between layers of hard rock below the water table.
(b) The process of evaporation of water in the ground is called infiltration.
Correct definition : The process of seeping of water in the ground is called infiltration.
(c) The evaporation of water from oceans and its arrival back into oceans is called vapour cycle.
Correct definition : The evaporation of water from oceans and its arrival back into oceans is called water cycle.
Question no – (13)
Answer :
(a) Wells : – The rainwater and groundwater are the sources of well water.
(b) Ground : – The rain water that seeps into the ground is the source of rainwater.
(c) Atmosphere : – The water of lakes, rivers, ponds, oceans seas and other surface waters that evaporate into the sky are the sources of atmospheric water.
Question no – (14)
Answer :
(a) The process of seeping of water into ground is called filtration
This statement is False.
Reason : The process of seeping of water into ground is called infiltration.
(b) 51% of the earth’s surface is covered with water
This statement is False
Reason : 71% of the earth’s surface is covered with water.
(c) Year 2003 was observed as the International Year of Freshwater
This statement is True.
(d) Snow and ice both are solid forms of water
This statement is True.
Short Answer Questions :
Question no – (15)
Answer :
The rainwater and water from other sources such as rivers and ponds seeps through the soils and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called infiltration.
Question no – (16)
Answer :
Rajasthan is a hot and dry place. The challenge of natural scarcity of water was met by a successful experiment. A band of social workers had transformed a dry area into a green place. They have revived five dried-up rivers by constructing water harvesting structures.
Question no – (17)
Answer :
The correct order of the given statements are –
(i) Increasing population create demand for construction of houses, shops, offices, roads and pavements
(ii) This decreases the open areas like park, and playgrounds.
(iii) Which in turn decreases the seepage of rain water into the ground.
(iv) This results in depletion of water table and creates scarcity of more water
Question no – (18)
Answer :
(i) In nature the three forms of water can be seen in the form of snow (solid) that covers the top of mountains, in the form of water(liquid) that covers 71 % of the earths surface and in the form of water vapor (gas)that usually comes down in the form of rain.
(ii) In home the three forms of water can be seen in the form of ice (solid ) that we keep in the refrigerator , in the form of water (liquid) that we drink or bath with and in the form of steam ( gas) which evaporates when we boil water.
Question no – (19)
Answer :
Form of water :
(a) Liquid
(b) Solid
(c) Gas
Process by which it is formed :
(a) Melting and Condensation
(b) Freezing
(c) Evaporation
Location where found :
(a) Found in water bodies like river, oceans, ponds, lakes etc.
(b) Found in mountains, Hills, refrigerators, Glaciers, poles etc.
(c) Found in atmosphere In form of water vapour.
Question no – (20)
Answer :
| Column I | Column II |
| (a) ground water → | (v) water table |
| (b) bawri → | (iv) small water |
| (c) snow → | (i) solid form of water |
| (d) drip irrigation → | (iii) water management |
| (e) leaking taps → | (ii) wastage of water |
Question no – (21)
Answer :
(a) WASHFERRET → Freshwater
(b) CHARREGE → Recharge
(c) QUIFERA → Aquifer
(d) WOSN → Snow
Question no – (22)
Answer :
(a) Clouds gets water from the atmosphere where water vapour are present in the liquid form.
(b) Plants get water from soil by extracting ground water which is present in liquid form above the layers of rock.
(c) Mountains tops gets water from atmosphere which get deposited on the top in the form of snow that is solid in nature.
(d) Aquifer gets water from rain which is present in the liquid form .
(e) Animals gets water from water bodies like lakes , ponds , rivers and rain in the liquid form.
Long Answer Questions :
Question no – (24)
Answer :
The water from rain and other sources that seeps underground from the pores in the soils and gets collected above the layer of rocks underneath are know as ground water. Groundwater are usually the sources for spring, well, aquifers etc.
Question no – (25)
Answer :
Water is very precious for all the living beings and if we don’t save water now we will face innumerous problems. Plants would not survive without water and so no more oxygen will be produced. Due to absence of water there would be no more water cycle and the earth will much hotter than it is now. There would be no water for us drink and for all others activities that requires water.
Other Chapter Solutions :
👉 Heat
👉 Physical and Chemical Changes
👉 Weather, Climate and Adaptation of Animals to Climate
👉 Soil
👉 Transportation in Animals and Plants
👉 Electric Current and Its Effects
👉 Light
👉 Wastewater Story
