Paper, spirit, branch of a tree, glass tumbler, coin, steel plate, piece of cork, sandpaper, talcum powder, butter, milk, air, copper wire, honey, shampoo, cotton wool, windowpane, soap, dough for chapatti, the lump of plasticine, water, lime juice, oil, smoke, steam, petrol, kerosene, stone, mirror, iron nail, salt, sugar, ice, flour, drinking straw, plastic ruler, cooking gas, aluminum foil, rubber band, oxygen, sand.
From the list find an object that can be pulled into different shapes and that will return to its original shape when released. What material is it made of?

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Solution

Elasticity: When an external force is applied to a rigid body there is a change in its length, volume (or) shape.
When external forces are removed the body tends to regain its original shape and size.
Such a property of a body by virtue of which a body tends to regain its original shape (or) size when external forces are removed is called elasticity.
From the above materials, the answer is-
Materials like this are said to be elastic.
It is a rubber band, that can be pulled into different shapes and that will return to its original shape when released.

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paper, spirit, branch of a tree, glass tumbler, coin, steel plate, piece of cork, sandpaper, talcum powder, butter, milk, air, copper wire, honey, shampoo, cotton wool, windowpane, soap, dough for chapatti, the lump of plasticine, water, lime juice, oil, smoke, steam, petrol, kerosene, stone, mirror, iron nail, salt, sugar, ice, flour, drinking straw, plastic ruler, cooking gas, aluminum foil, rubber band, oxygen, sand

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