Chapter 16: Water - A Precious Resource

  Science

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  Chapter 16: Water - A Precious Resource

   Class: VII

 

  Multiple Choice Questions

Question 1

Which of the following does not show water shortage?

(a) Taps running dry.

(b) Long queues for getting water.

(c) Marches and protests for demand of water.

(d) A family gets three buckets of water per person per day.

 

Answer 1

(d)

 

Question 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

(a) 0.006%.

(b) 0.06%.

(c) 0.6%.

(d) 6%.

Answer 2

(a)

Question 3

Which of the following are not the liquid forms of water?

(i) Snow

(ii) Lake water

(iii) River water

(iv) Water vapour

(v) Ice

Choose the correct combination from the options below.

(a) (i), (iv) and (v) (b) (i) and (ii)

(c) (ii) and (iii) (d) (iv) only

Answer 3

(a)

Question 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

(a) water level.

(b) water table.

(c) ground water.

(d) water limit.

Answer 4

(b)

Question 5

Which of the following is a way to use water economically?

(a) Construction of bawris

(b) Rainwater harvesting

(c) Drip irrigation

(d) Infiltration

Answer 5

(c)

Question 6

On which of the following day is World Water Day observed?

(a) 22 March

(b) 14 November

(c) 2 October

(d) 21 December

Answer 6

(a)

Question 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

(a) 5 litres

(b) 15 litres

(c) 30 litres

(d) 50 litres

Answer 7

(d)

Question 8

"Every Drop Counts" is a slogan related to

(a) counting of drops of any liquid.

(b) counting of water drops.

(c) importance of water.

(d) importance of counting.

Answer 8

(c)

Question 9

Water cycle does not involve which of the following?

(a) Evaporation

(b) Condensation

(c) Formation of clouds

(d) Rainwater harvesting

Answer 9

(d)

Question 10

Which of the following inhibits the seepage of rainwater into ground?

(a) A pukka floor

(b) Playground

(c) Grass lawn

(d) Forest land

Answer 10

(a)

Very Short Answer Questions

Question 11

State whether the following statements are True or False. If false, write the correct statement.

(a) Water vapour is the gaseous form of water.

(b) Ice is solid whereas snow is the semi-solid form of water.

(c) Ocean water cannot be used for domestic purposes.

(d) Rapid growth of industries is one of the causes for water shortage.

Answer 11

(a) True (b) False, snow is also a solid form of water. (c) True (d) True

Question 12

Some definitions are given below which can be corrected by changing one word. Correct them.

(a) Aquifer is ground water stored between layers of hard rock above the water table.

(b) The process of evaporation 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.

Answer 12

(a) change "above" with "below"

(b) change "evaporation" with "seeping"

(c) change "vapour" with "water"

Question 13

What is the source of water in each of the following ?

(a) Wells

(b) Ground

(c) Atmosphere

Answer 13

(a) from ground water

(b) rain

(c) evaporation

Question 14

State whether the following statements are True or False. If false, give the correct statement.

(a) The process of seeping of water into ground is called filtration.

(b) 51% of the earth’s surface is covered with water.

(c) Year 2003 was observed as the International Year of Freshwater.

(d) Snow and ice both are solid forms of water.

Answer 14

(a) False, it is called infiltration

(b) False, it is 71% not 51%.

(c) True

(d) True

Short Answer Questions

Question 15

Fill in the blanks in the given passage.

The rainwater and ________________ from other sources such as rivers and ponds seeps through the ______________ and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called ______________.

Answer 15

water, soil, infiltration

 

Question 16

Fill in the blanks and complete the story selecting words from

the box given here.

cold, demand, leaders, dry, hot, scarcity, workers, wet, oceans, harvesting, rivers

Rajasthan is a _________ and dry place. The challenge of natural _______ of water was met by a successful experiment. A band of social ________ had transformed a _________ area into a green place. They have revived five dried-up ________ by constructing water ___________ structures.

Answer 16

hot, scarcity, workers, dry, rivers, harvesting.

Question 17

Place the following statements in a proper order to form a meaningful paragraph.

(a) Which in turn decreases the seepage of rain water into the ground.

(b) This decreases the open areas like park, and playgrounds.

(c) Increasing population create demand for construction of houses, shops, offices, roads and pavements.

(d) This results in depletion of water table and creates scarcity of more water.

Answer 17

(c), (b), (a), (d)

 

Question 18

How can you observe the three forms of water in (i) nature and (ii) at home?

Answer 18

Hint:

(i) Nature - Snow, water, water vapour

(ii) Home - Ice, water, steam

Question 19

Complete the given table

 

Answer 19

(a) Condensation and melting; water bodies like rivers, lakes, etc.

(b) Freezing; Cold regions like high mountains, poles, etc.

(c) Evaporation; atmosphere.

Question 20

Match Column I with Column II

 

Answer 20

(a) (v); (b) (iv); (c) (i); (d) (iii); (e) (ii)

Question 21

A list of jumbled words are given here. Write the correct form of each word.

(a) WASHFERRET (b) CHARREGE (c) QUIFERA (d) WOSN

Answer 21

(a) freshwater (b) recharge

(c) aquifer (d) snow

Question 22

From where do the following usually get water? In which form is water present in them?

(a) Clouds (b) Plants

(c) Mountain tops (d) Aquifer

(e) Animals

Answer 22

(a) land; liquid form (droplet of water).

(b) soil; liquid form.

(c) atmosphere; solid form.

(d) rain; underground water.

(e) water bodies; liquid.

 

Long Answer Questions

 

Question 23

Complete the following chart by writing appropriate words in the boxes marked (a) to (e).

 

Answer 23

(a) solid (b) gaseous (c) well (d) lake (e) ice

Note: For (c) and (d) other sources of water (such as pond, spring,

etc.) may also be given.

Question 24

What is ground water? What are the sources of water which are fed by ground water?

Answer 24

Hint:

Water present underground; well, lake, pond, spring, hand

pump, etc.

Question 25

Water is very precious for all the living beings. What will happen in future if we do not save water now?

Answer 25

 

Hint:

There will be scarcity of water and we will not be able to do

various activities where water is required. It will also affect life

on earth.