Air and Water - Class 3 Science - Question and Answer 

Air and water are very important for all living things. We cannot see air, but it is all around us. Air helps us to breathe, fly kites, and move things like sailing boats and windmills. It also carries clouds, dust, and smoke.

Water is another gift of nature. All plants, animals, and humans need water to live. We use water for drinking, cooking, washing, bathing, cleaning, and farming. Without air and water, life cannot exist on Earth.

This chapter will help us learn about the importance of air and water, their uses, and ways to keep them clean.

Air and Water - Class 3 Science - Question and Answer

What is air?

Ans:- Air is a natural thing which we can feel but can not see or touch. It helps us in breathing.

How many types of air according to movement?

Ans:- There are four types of air according to movement.

1- Still air

2- breeze

3- wind

4- storm

What is still air?

Ans:- When air does not move, It is called still air.

What is breeze?

Ans:- gentle moving air is called breeze. It is soft and pleasant.

What is wind?

Ans:- Fast moving air is called wind.

What is storm?

Ans:- Very fast and strong air along with rain and thunder is called storm. It is very harmful.

What does air contain?

Ans:- Air contains many gases, water vapours, dust particles, smoke and germs.

Name the main gases present in the air

Ans:- The main gases present in the air are nitrogen, oxygen, and carbon dioxide.

Write eight uses of air.

Ans:- The eight uses of air are

1- All living things breathe in oxygen present in air.

2- plants need carbon dioxide present in air to make food.

3- nitrogen is very important for the growth of the plants.

4- air is needed for burning. oxygen in the air helps in burning. 

5- air helps birds to fly.

6- air helps to run wind mills.

7- air dries our clothes faster.

8- air fills up our balloons and tyres. 

How many main sources of water? Name them.

Ans:- There are three main sources of water.

1- rain water

2- surface water

3- underground water

What is rain water?

Ans:- Water that we get in the form of rain is called rain water. It is the main source of water.

What is surface water?

Ans:- Water that is found on the surface of earth is called surface water.

Ex:- rivers, lakes, ponds, oceans etc.

What is underground water?

Ans:- Water that is found under the surface of earth is called underground water.

Ex:- well, handpump, tubewells etc.

How many forms of water?

There are three forms of water.

1- solid

2- liquid

3-gas

Which is the solid form of water?

Ans:- Ice

Which is the liquid form of water

Ans:- water

Which is the gasious state of water?

Ans:- water vapour

What is melting?

Ans:- Melting is the process by which a substance changes from the solid phase to the liquid phase.

      Ex:- Ice melts to become water that is liquid.

What is evaporation?

Ans:- Evaporation is the process by which a substance changes from liquid phase to the gasious phase.

  Ex:- Water boils to become water vapour that is example of evaporation.

What is condensation?

Ans:- Condensation is the process by which a substance changes from gasious phase to the liquid phase.

      Ex:- Water vapour cools to become water.

What is freezing?

Ans:- Freezing is the process by which a substance changes from liquid phase to the solid phase.

     Ex:- When water cools down below the 0 degree celsius it becomes ice.

What is water cycle?

Ans:- The circulation of water on the earth in cyclic manner from land to sky and back to the land is called water cycle.

Write five uses of water.

Ans:- The five uses of water are

1- All living things need water to live.

2- Plants need water to prepare food.

3-We need water for drinking, cooking, bathing and cleaning

4- Flowing water is used for generate electricity.

5- Water is used in industries to carry out various processes.