200 GK Question FROM SOCIAL SCEINCE STD 7

Solid Liquid & Gas

Fig:States of Matter

Solid: Solid has definite shape and definite volume. Examples: Stones, wood, plastic, common salt, steel, ice, glass, etc.
Liquid: Liquid has indefinite shape but definite volume. Examples: Water, milk, oil, etc.
Gas: Gas has indefinite shape and indefinite volume. Examples: Oxygen, nitrogen, carbon dioxide, etc.

Other Criteria For Sorting Materials:

Appearance: Different materials look different from each other. The appearance depends on colour, hardness, texture, and lustre.
Hardness: hardness is another property of materials. Some materials are very hard while some are very soft.
Hard: Material which are difficult to compress are called hard, e.g. diamond, stone, wood, steel, etc. Diamond is the hardest natural substance.
Soft: Materials which can be compressed easily are called soft, e.g. chalk, cotton, rubber, etc.

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