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प्रश्न
Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.
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उत्तर
Examples of reversible changes.
- Melting of wax
- Folding of a paper
- Inflating a tyre or balloon
- Knitting of a sweater
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संबंधित प्रश्न
Very Short Answer Type Question:
Some common changes are given in the below Table. Which of these changes do you think can be reversed?
| Change | Can be reversed |
| (i) Raw egg to boiled egg | Yes/No |
| (ii) Batter to idli | |
| (iii) Wet clothes to dirty clothes | |
| (iv) Woollen yarn to knitted sweater | |
| (v) Grain to its flour | |
| (vi) Cold milk to hot milk | |
| (vii) straight string to a cold string | |
| (viii) Bud to flower | |
| (ix) Milk to paneer | |
| (x) Cow dung to biogas | |
| (xi) stretched rubber band to its normal size | |
| (xii) Melting of ice-cream |
Long Answer Type Question:
How does curd being set? Is this change reversible?
Change is the ______ of a substance from one form to another.
Differences between
reversible and irreversible changes are:
Look at the figure which shows three situations.
Which of these shows a reversible change and why?
Boojho’s sister broke a white dove, a symbol of peace, made of Plaster of Paris (POP). Boojho tried to reconstruct the toy by making a powder of the broken pieces and then making a paste by mixing water. Will he be successful in his effort? Justify your answer.
Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
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.
Change of a bud into a flower is a change which cannot be reversed. Give four more such example.
Find the odd one out. Give reason for your choice.
