C. LONG ANSWER TYPE QUESTIONS
1. State three changes which are reversible and three which are irreversible.
2. Give three points of difference between reversible and irreversible changes.
3. Give an experiment to show that solids expand on heating.
4. Describe some ways with examples to bring about a change.
5. In a wooden wheel, why is the metallic rim made slightly shorter than the wheel?
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1.Making a chapati,making candle, stretching a rubber band,ice cube are reversible.
melting of wax,torn paper,fried chapati, Burst balloon are irreversible
2.The substances which can change into original shape are called reversible whereas the substances which cannot come into original shape are irreversible.Example:making a dough is reversible whereas fried chapati are irreversible.
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