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

Out of these which one is not a source of surface water?

1

(a)

Rainwater

(b)

River and lake water

(c)

Spring water

(d)

Sea water

Which of these is a result of condensation of water vapours?

1

(a)

Rain

(b)

Snowfall

(c)

Hail

(d)

Tiny water droplets

Clouds are

1

(a)

tiny drops of water floating in air

(b)

mixture of dust and water vapour

(c)

particles of water vapour

(d)

rain drops in air

Water occurs in the atmosphere in how many forms?

1

(a)

One

(b)

Two

(c)

Three

(d)

Four

Water harvesting is a technique of

1

(a)

Flooding water

(b)

Farming water

(c)

Stopping flood

(d)

Saving rain water

When we move up in air, the temperature becomes:

1

(a)

Very high

(b)

Little high

(c)

Low

(d)

Very low

Water cycle is a

1

(a)

continuous process

(b)

drinking process

(c)

non-continuous process

(d)

non-cyclic process

Water changes to ice at

1

(a)

0°C 

(b)

100°C

(c)

102°C

(d)

98°C

The process of changing water into its vapour is called__________

1

(a)

evoporation

The process of changing water vapour into water is called ______

1

(a)

condensation

No rainfall for a year or more may lead to________ in that region.

1

(a)

droughts

Excessive rains may cause __________

1

(a)

floods

State for each of the following whether it is due to evaporation or condensation. Water drops appear on the outer surface of a glass containing cold water.

1

(a)

Condensation

Water is colourless, odourless and_______

1

(a)

tasteless

_______is a method to collect rain water on the rooftops of the buildings

1

(a)

Rain water harvesting

Water evaporates from different water bodies due to the _______of the________

1

(a)

heat, sun

The water droplets collect together to form_______

1

(a)

clouds

_______is a pure from of water.

1

(a)

Rain water

Water vapour is present in air only during the monsoon.

1

(a) True

(b) False

Water evaporates into air from oceans, rivers and lakes but not from the soil.

1

(a) True

(b) False

The process of water changing into its vapour is called evaporation.

1

(a) False

(b) True

The evaporation of water takes place only in the sunlight.

1

(a) True

(b) False

Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.

1

(a) False

(b) True

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)

Explain the formation of rain

2

(a)

Mention three ways by which water evaporates.

2

(a)

In arctic region, when ice is formed in oceans, how do aquatic animals survive there?

2

(a)

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

3

(a)

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

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)

Do people living in different regions of a country get the same amount of water?

3

(a)

People living in which region do not get adequate amount of water? How do they manage?

3

(a)