Question

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Answer 1

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Shivam

Answer 2

2.Two examples of reversible change-:
Melting of ice.
Melting of wax.

3.Two examples of irreversible change-:
falling mango from the tree.
firing of bullets.

4.Some examples of irreversible biological changes that occurs in nature are..
Germination of seed
Flowering of bud
Formation of biogas from cow dung

5. i]Rubbing of stone is the example of physical change in which energy is heat energy is given out.
ii] Conversion of water vapours into water is the example of physical change in which energy is absorbed..

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