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प्रश्न
A potter working on his wheel shaped a lump of clay into a pot. He then baked the pot in an oven. Do these two acts lead to the same kind of changes or different? Give your opinion and justify your answer.
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उत्तर
The two acts lead to the different kind of changes. Shaping of pot on a wheel is a physical, reversible change while baking the pot in an oven is an irreversible change.
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संबंधित प्रश्न
Long Answer Type Question:
How does curd being set? Is this change reversible?
Circle the odd one.
Water on ______ changes to ice and on ______ comes back to water.
Evaporation of water is a reversible change.
Can we reverse the following change? If yes, suggest the name of the method.
Water vapour into water
Which of the following changes cannot be reversed?
- Blowing of a balloon
- Folding paper to make a toy aeroplane
- Rolling a ball of dough to make roti
- Baking cake in an oven
- Drying a wet cloth
- Making biogas from cow dung
- Burning of a candle
Give one example of change which occurs on heating but can be reversed.
Give one example of change occurs on mixing two substances, but can be reversed.
Give one example of change which occurs on mixing two substances, but cannot be reversed.
Choose the odd one out. Give reason for your choice.
