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

1

(a)

Washing clothes

(b)

Bathing

(c)

Cleaning utensils

(d)

Drying wet clothes

In which of the following cases, evaporation of water will be slowest?

1

(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

Transpiration is a process in which plants

1

(a)

receive water from soil

(b)

absorb water vapour from air

(c)

prepare food from water

(d)

release water in the form of water vapour

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

1

(a)

one bucket

(b)

ten buckets

(c)

two glasses

(d)

few drops

Wells are fed by

1

(a)

pond water 

(b)

lake water

(c)

rainwater

(d)

groundwater

Floods cause extensive damage to

1

(a)

crops

(b)

property and human life 

(c)

domestic animals

(d)

All of the above

Catch water where it falls is the basic idea behind

1

(a)

recycling of water

(b)

makinq dams to store water

(c)

rainwater harvesting

(d)

condensation of water vapour

Water harvesting is a technique of

1

(a)

Flooding water

(b)

Farming water

(c)

Stopping flood

(d)

Saving rain water

Observe the given figure and tell which process is taking place

1

(a)

Condensation

(b)

Evaporation

(c)

Transpiration

(d)

None of the above

About 97% of the water on the earth is

1

(a)

salt water 

(b)

pure water

(c)

polluted water

(d)

drinking water

The process of changing water into its vapour is called__________

1

(a)

evoporation

State for each of the following whether it is due to evaporation or condensation. Steam rising from wet clothes while they are ironed.

1

(a)

Evaporation

Water, as ___________goes into atmosphere by the processes of___________ and___________ and forms___________ which on condensation fall in the form of___________ and___________.

1

(a)

vapours, evaporation, transpiration, clouds, rains, snow/hails

The rainwater can be used to ________ groundwater.

1

(a)

recharge

In our country, most of the rainfall occurs during the ________ season.

1

(a)

monsoon

The evaporation of water takes place only in the sunlight.

1

(a) True

(b) False

Water vapour enters into air through evaporation.

1

(a) False

(b) True

Water vapour is present in the environment during monsoon season only.

1

(a) True

(b) False

Water is non-renewable natural resource

1

(a) True

(b) False

Water changes to ice at 0°C.

1

(a) False

(b) True

Water is present on earth in which states of matter?

1

(a)

In all three states, i.e., solid, liquid and vapour.

Which property of water is responsible to maintain the body temperature?

1

(a)

Evaporation

How does water cycle help in maintaining global climate?

1

(a)

Water cycle plays an important role in maintaining the global climate as :
(i) Water cycle maintains the temperature on land.
(ii) Water cycle regulates the groundwater level.

What is fog?

1

(a)

Fog is a form of condensed water vapours on dust particles in air and it occurs near the surface of the earth during winter season

Look at Fig.

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

1

(a)

The activities, in which water is being used are given below:
(i) Bathing
(ii) Washing of clothes

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

2

(a)

Name two main processes which transfer water present on the earth into water vapour continuously.

2

(a)

Is oxygen soluble in water? How is this important?

2

(a)

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

2

(a)

Why do some water pipes burst in winter?

2

(a)

Why do wet clothes placed on a clothes line dry after sometime? Explain. 

3

(a)

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

3

(a)

How do the areas covered with concrete affect the availability of groundwater?

3

(a)

Sachin was very hungry one day. He went to kitchen where his mom was cooking food. He suddenly opened the lid of freshly cooked rice and found tiny drops of water on the under side of the lid. He became curious to know the cause of the presence of water drops on the under side of lid.
(a) Why was droplets present on the lid of container?
(b) What will happen if lid is opened during cooking?
(c) Do you observe any values in Sachin? Name them.

3

(a)

Water is one of our most precious commodities and no life can survive without it It has been predicted that water scarcity will become the subject of "Wars"in the near future. Write any two ways in which water is getting polluted. Write any two measures to stop water pollution at your level

3

(a)

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

5

(a)

State different uses of water

5

(a)

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

5

(a)