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# Matter and Materials

Everything on Earth is made up of matter. There are three basic states of matter: solid, liquid, and gas.

## Solid

A solid is anything that holds a particular size and shape.

An apple, a block of wood, and a coin are all solids. The only way they can change their shape is by force (for instance, if you bite the apple with your teeth or chop the block of wood with an axe).

The particles in solid are tightly packed and don't make a lot of movements. There is not much free space in between the particles, so there is very little room for the particles to move.

## Liquid

A liquid is anything that has size or volume but does not have a shape. Liquids must be contained in a cup, bottle, or some container in order to have a shape. Milk, water, and juice are liquids. When you pour milk into a glass, it takes the shape of the glass. If you spill the glass of milk on the floor, it will spread quickly as it takes the shape of the floor.

Particles of liquid are not as close together as particles in a solid and move around much more freely. They have no regular shape or arrangement and move freely.

## Gas

Gases are hard to identify because they have no colour, size or shape. When we take a deep breath our lungs fill up with air. Air is a combination of many gases.

The particles in a gas move freely at high speeds. There is a lot of free space in between the particles, and they take the shape of any container.

## Quiz for Matter and Materials

 Q.1 Fill in the blank. Matter is everything that has mass and occupies ______ a) Shape b) Colour c) Space d) Size
 Q.2 Use the given diagram to answer the questions: Which of these containers has a solid? a) C b) B c) D d) A
 Q.3 Among the given materials which has closely packed molecules? a) Book b) Ink c) Ghee d) Air
 Q.4 Which of these cannot be called matter? a) Spoon b) Balloon c) Gas d) Love
 Q.5 In which of the following the speed of flow of matter is very high? a) Solid b) Liquid c) Gas d) none of the above
 Q.6 Plants and animals that live in water breathe because of ____________. a) dissolved salt b) dissolved oxygen c) dissolved minerals d) dissolved dust
 Q.7 A is a) Liquid b) Metal c) Solid d) None of the above
 Q.8 D is a) Gas b) Solid c) Liquid d) None of the above
 Q.9 In which of these matter, molecules have very weak force of attraction? a) Milk b) Chair c) Chocolate d) Smell of Perfume
 Q.10 Use the given diagram to answer the questions: A is a) on cooling b) on heating c) on throwing d) none of the above