Chapter 14: Water

Science

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Chapter 14: Water

  Class: VI

  Exemplar Solutions

  Multiple Choice Questions

Question 1

Which of the following activity does not involve use of water?

 

(a) Washing clothes

(b) Bathing

(c) Cleaning utensils

(d) Drying wet clothes

Answer 1

(d)

Question 2

In which of the following activities will you use minimum amount of water?

 

(a) Bathing

(b) Brushing teeth

(c) Washing clothes

(d) Mopping a room

Answer 2

(b)

Question 3

The quantity of water required to produce one page of your book is

 

(a) one bucket

(b) ten buckets

(c) two glasses

(d) few drops

Answer 3

(c)

Question 4

Water in our tap comes from a

 

(a) river

(b) lake

(c) well

(d) river, lake or well

Answer 4

(d)

Question 5

In which of the following case evaporation of water will be slowest?

 

(a) A tray of water kept in sunlight.

(b) A kettle of water kept on a burner.

(c) A glass of water kept in a room.

(d) A bucket of water kept on rooftop.

Answer 5

(c)

Question 6

Transpiration is a process in which plants

 

(a) receive water from soil.

(b) absorb water vapor from air.

(c) prepare food from water.

(d) release water vapor.

Answer 6

(d)

Question 7

Clouds are

 

(a) tiny drops of water floating in air.

(b) mixture of dust and water vapor.

(c) particles of water vapor.

(d) rain drops in air.

 

Answer 7

(a)

Question 8

Wells are fed by

 

(a) pond water.

(b) lake water.

(c) rain water.

(d) ground water.

Answer 8

(d)

Question 9

Floods cause extensive damage to

 

(a) crops.

(b) property and human life.

(c) domestic animals.

(d) all of the above.

Answer 9

(d)

Question 10

"Catch water where it falls" is the basic idea behind

 

(a) recycling of water.

(b) making dams to store water.

(c) rain water harvesting.

(d) condensation of water vapor.

Answer 10

(c)

 

Very Short Answer Questions

 

Question 11

Look at Fig. 14.1.

Fig.14.1

Write down activities shown in this figure in which water is being used.

 

Answer 11

 

(i)  Bathing

(ii) Washing clothes

 

Question 12

 

Write any two activities which require more than a bucket of water.

 

Answer 12

 

(i) Washing 10 clothes

(ii) Irrigating a crop field

 

Question 13

 

Write any two activities which require less than one bucket of water.

 

Answer 13

 

(i) Brushing your teeth

(ii) Washing a handkerchief

 

Short Answer Questions

 

Question 14

 

Why do wet clothes placed on a clothes line get dry after some time? Explain.

 

Answer 14

 

Water present in wet clothes is converted into water vapor due to evaporation and leaves them dry.

 

Question 15

 

Water kept in sunlight gets heat from sun and is evaporated. But how does water kept under the shade of a tree also gets evaporated? Explain.

 

Answer 15

 

Air around us gets heated from sunlight. This warm air provides heat for evaporation of water kept in the shade.

 

Question 16

 

How do the areas covered with concrete affect the availability of ground water?

 

Answer 16

 

Areas covered with concrete reduce the seepage of rain water into the ground and this reduces the availability of ground water.

 

Question 17

 

Why is there a need for conserving water? Give two reasons.

 

Answer 17

 

(i) Increasing population need more water.

(ii) Availability of water is decreasing day-by-day.

 

Question 18

 

Fill in the blanks selecting words from the following list

 

snow, rain, clouds, vapor, evaporation, transpiration.

 

Water, as _____ goes into atmosphere by the processes of ______

and _____ and forms ________, which on condensation fall in

the form of ______ and _______.

 

 

Answer 18

 

vapor, evaporation, transpiration, clouds, snow, rain.

 

 

Long Answer Questions

 

Question 19

 

Most of the water that falls on the land as rain and snow, sooner or later goes back to a sea or an ocean. Explain how it happens?

 

Answer 19

 

It happens according to the following chain or process:

 

Snow/Rain®Streams/Rivers®Sea/Ocean.

 

Question 20

 

Draw a diagram to show how sea water reaches a lake or pond.

 

Answer 20

 

Draw diagram showing evaporation of water from sea, which form clouds in the sky. These clouds form rain. Rain water flows into lake or pond.

 

Question 21

 

Dissolve two spoons of common salt in half a cup of water. Now if you want to get the salt back, what will you do?

 

Answer 21

 

Water may be removed from the salt solution by heating it on a stove or keeping it in the sun in a plate for few hours.

 

Question 22

 

Explain the process of rooftop rain water harvesting with the help of a suitable diagram.

 

 

Answer 22