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प्रश्न
Give a reason why –
Solids have a definite volume & a definite shape.
उत्तर
Any matter that is solid has a definite shape and a definite volume. The molecules in a solid are in fixed positions and are dose together. Although the molecules can still vibrate, they cannot move from one part of the solid to another part. As a result, a solid does not easily change its shape or its volume.
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संबंधित प्रश्न
Water cycle is an example of inter conversion of states of water. Explain.
Give reason for the following.
Pure substances have fixed melting or boiling points.
Fill in the blank:
The temperature at which a liquid boils is called the................. point of that liquid.
Write whether the following statement is true or false.
A gas has no free surface.
Gases
- cannot be compressed easily,
- occupy the entire space of the container.
- have definite shapes.
- cannot flow.
What happens when a solid is heated ?
Why liquids do not have a definite shape ?
Give reasons for the following:
Water on freezing turns into ice.
Describe simple experiment to show that particles of matter are closely packed in solids and less in liquids.
Match the following.
| Property | Example |
| Breaks easily (Brittle) | Metal pan |
| Bends readily | Rubber band |
| Can be stretched easily | Cotton wool |
| Gets compressed easily | Mud pot |
| Gets heated readily | Plastic wire |
