Ncert exemplar solutions science class 7 Solutions for Chapter 16 water a precious resource

Which of the following does not show water shortage?

(a) Taps running dry.

(b) Long queues for getting water.

(c) Marches and protests for the demand of water.

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

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%.

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

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) groundwater.

(d) water limit.

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

(a) Construction of bawris

(b) Rainwater harvesting

(c) Drip irrigation

(d) Infiltration

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

(a) 22 March

(b) 14 November

(c) 2 October

(d) 21 December

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

“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.

Water cycle does not involve which of the following?

(a) Evaporation

(b) Condensation

(c) Formation of clouds

(d) Rainwater harvesting

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

(a) A pukka floor

(b) Playground

(c) Grass lawn

(d) Forest land

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) The rapid growth of industries is one of the causes of water shortage.

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

(a) An aquifer is a groundwater 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.

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

(a) Wells

(b) Ground

(c) Atmosphere

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

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

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

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

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

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 ______________.

Fill in the blanks and complete the story selecting words from the box given here.

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.

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

(a) Which in turn decreases the seepage of rainwater 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 the water table and creates scarcity of more water.

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

Complete the given table

Match Column I with Column II

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

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

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

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

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

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