Case Study Questions Class 7 Science Water: A Precious Resource

Case Study Questions Class 7 Science Chapter 16 Water: A Precious Resource

CBSE Class 7 Case Study Questions Science Water: A Precious Resource. Important Case Study Questions for Class 7 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Water: A Precious Resource.

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

CBSE Case Study Questions Class 7 Science Water: A Precious Resource

Case study 1

22 March is celebrated as the world water day. We celebrate water day every year to attract the attention of everybody towards theimportance of conserving water. The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene is a minimum of 50 liters perperson per day. This amount is about two and a half buckets of water perperson per day.

 In some places there is an acute shortage of water. Taps running dry, long queues for water, fights, marches and protests for demand of water have become a common sight, especially during summers. Year 2003 was observed as the International Year of Freshwater to make people aware of this dwindling natural resource.

Source: NCERT

Que. 1) Which day is celebrated as world water day?

(a) 2 December

(b) 15 January

(c) 15 March

(d) 22 March

Que. 2) Which year was observed as an international year of fresh water?

(a) 2010

(b) 2000

(c) 1999

(d) 2003

Que. 3) According to United Nations the amount of water required by per person per day is……………………………………………………..…………………………………….

(a) 50 liters

(b) 80 liters

(c) 5 liters

(d) None

Que. 4) During which season the crisis of water really become more?

Que. 5) Why water day is celebrated every year?

Answer Key

Que. 1)(d) 22 March

Que. 2) (d) 2003

Que. 3) (a) 50 liters

Que. 4) Answer: During summer season the crisis of water becomes more because most the water sources like ponds, wells, etc. dries up.

Que. 5) Answer: Water day is celebrated every year to attract the attention of ever body that conservation of water is very important.

Case study 2

Water shortage has become a matterof concern throughout the world. It is

Estimated that in a few years from now more than one third of the people in

The world could face water scarcity. We are aware that about 71% of the earth’s surface is covered withwater. Almost all the water on theearth is contained in the seas andoceans, rivers, lakes, ice caps, asgroundwater and in the atmosphere.However, most of this water is not fit forhuman consumption directly. The water that is fit for use is freshwater.

Bhujpur in the Kutch area of Gujarat has a very erratic rainfall. The only sourceof freshwater lies underground because rivers in this area do not have waterthroughout the year. Over the years, demand for water has grown. The withdrawalof groundwater has far exceeded recharge. As a result the water table has gonedown alarmingly.In 1989, the villagers along with a non-governmental organization, decided toharvest rainwater. Eighteen check-dams were built on the Rukmavati River andits many tributaries. The water so collected increased percolation through thesoil and recharged the aquifers.

According to farmers, the wells have water now and the water that flowed intothe sea and was wasted has become available for irrigation.

Que. 1) How many people could face water scarcity in the world?

(a) One third

(b) two third

(c) 70%

(d) None.

Que. 2) Bhujpur in the………………………………………………………………………..area of Gujarat where there is erratic rainfall.

(a) Kutch

(b) Bhuj

(c) Gandhi nagar

(d) Ahmedabad

Que. 3) In which year the villagers along with the NGOs decided to harvest rainwater.

(a) 1989

(b) 1970

(c) 2000

(d) 1998

Que. 4) Where is all the water contained on the earth?

Que. 5) Which water can be used for human consumption?

Answer Key

Que. 1)(a) One third

Que. 2) (a) Kutch

Que. 3) (a) 1989

Que. 4) Answer: All the water on earth is present in seas, oceans, ponds, wells, ground water and some of it in the atmosphere.

Que. 5) Answer: Only fresh water can be used for human consumption.

Case study 3

Water on theearth has been maintained for millionsof years by various processes whichmake the water cycle. when water circulatesthrough the water cycle it can be foundin all the three forms, i.e., solid, liquidand gas—at any given time somewhereon the earth. The solid form, snow and ice, is present as ice caps at the poles of the earth, snow-covered mountains andglaciers. Liquid water is present in oceans, lakes, rivers, and evenunderground. The gaseous form is the water vapor present in the air around us. The continuous cycling of water among its three forms keeps the total amount of water on the earth constant even when the whole world is using it.

Source: NCERT

Que. 1) What are the three forms of water?

(a) Solid, liquid, chemical

(b) Solid, liquid, Solid

(c) Solid, Liquid, molecule

(d) Solid, liquid, gas

Que. 2) What is the gaseous form of water?

(a) Gas

(b) Molten

(c) Water vapour

(d) Vapour

Que. 3) Water is maintained on earth for several million of years by the process called as…………………………………………………………………………………………..

(a) Rock cycle

(b) Vapour cycle

(c) Earth cycle

(d) Water cycle

Que. 4) Where is liquid water present?

Que. 5) Give reason for unlimited availability of water on earth.

Answer Key

Que. 1)(d) Solid, liquid, gas

Que. 2) (c) Water vapour

Que. 3) (d) Water cycle

Que. 4) Answer: Liquidwater is present in oceans, seas, lakes, rivers, ponds, wells and underground water reservoirs.

Que. 5) Answer: The continuous cycle of water between its three forms i.e. solid, liquid and gas by the process of water cycle is the reason for unlimited availability of water on earth.

Case study 4

Most towns and cities have watersupply system maintained by the civicbodies. The water is drawn fromnearby lakes, rivers, ponds orwells. The water is suppliedthrough a network of pipes.Many villages do not have such

A water supply system. Therepeople fetch water directly fromthe sources. Often people andeven children have to walkseveral kilometers to fetch water. The children suffera lot. They cannot attendschool regularly since theyspend hours in fetching water. A large number of people draw water from wells, tube wells or hand pumps.

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 has transformed a dry area in the Alwar district into a green place. They have revived five dried-up rivers — Arveri, Ruparel, Sarsa, Bhagani and Jahazwali by constructing waterharvesting structures.

Que. 1) Which place is hot and dry and have very less water?

(a) Gujarat

(b) Rajasthan

(c) Mumbai

(d) Delhi

Que. 2) From where does a large number of peoples get water for their daily requirements?

(a) Tube wells, handpumps

(b) River

(c) Pond

(d) Ocean

Que. 3) ………………………………………………………………………….…..maintain the water supplies in most of cities and town.

(a) Civic bodies

(b) Water bodies

(c) Water cycle

(d) Govt

Que. 4) Who transformed Alwar district into a green place?

Que. 5) Why some children cannot attend school regularly?

Answer Key

Que. 1)(b) Rajasthan

Que. 2) (a) Tube wells, hand pumps

Que. 3) (a) Civic bodies

Que. 4) Answer: A band of social workers are the ones who is responsible for transforming Alwar district into a green place.

Que. 5) Answer: Some children cannot attend school regularly because they are busy fetching water from faraway places.

Case study 5

If we dig a hole in the ground near awater body we may find that the soil ismoist. The moisture in the soil indicatesthe presence of water underground. If

We dig deeper and deeper, we wouldreach a level where all the space betweenparticles of soil and gaps between rocksare filled with water. Theupper level of this layer is called thewater table. The water table varies from place to place, and it may even changeat a given place. The water table may beat a depth of less than a meter or maybe several meters below the ground. Thewater found below the water table iscalled groundwater.

The rainwater and water from othersources such as rivers and ponds seepsthrough the soil and fills the emptyspaces and cracks deep below theground. The process of seeping of waterinto the ground is called infiltration.The groundwater thus gets rechargedby this process. At places thegroundwater is stored between layers ofhard rock below the water table. This isknown as an aquifer. Water in theaquifers can be usually pumped out withthe help of tube wells or hand pumps.

Que. 1) What type of soil is present near a groundwater source?

(a) Dry

(b) Moist

(c) Hard

(d) Lumpy

Que. 2) The water found below the………………………………………………………………………..…………..is called as groundwater.

(a) Time table

(b) Water table

(c) Rocks

(d) Ground

Que. 3) Where is the ground water stored?

(a) Between the layers of hard rock

(b) Soft rocks

(c) Underground

(d) Lakes

Que. 4) Define infiltration.

Que. 5) How the water in the aquifers are pumped out?

Answer Key

Que. 1)(b) Moist

Que. 2) (b) Water table

Que. 3) (a) Between the layers of hard rock

Que. 4) Answer: The process of seeping of water like rainwater into the ground is called as infiltration.

Que. 5) Answer: Tube wells and hand pumps are used to pump out the water from aquifers.

Updated: March 18, 2022 — 3:57 pm

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