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प्रश्न
Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
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उत्तर
Recycling of paper cannot be classified as a reversible change because the quality, colour and texture of the paper changes on recycling and we get a different type of paper not the original one.
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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:
Explain how a metal rim slightly smaller than a wooden wheel can be fixed on it.
Analogy
Curdling of milk : irreversible change :: Formation of clouds : ________change
Water on ______ changes to ice and on ______ comes back to water.
The burning of the paper is an irreversible change.
Analogy:
Irreversible change: Making idly front batter.
Reversible change: ______.
While lighting a candle, Paheli observed the following changes.
- Wax was melting
- Candle was burning
- Size of the candle was reducing
- Melted wax was getting solidified.
Of the above, the changes that can be reversed are
Rolling of chapati and baking of chapati are the changes that ______.
Choose the odd one out. Give a reason for your choice.
Find the odd one out. Give reason for your choice.
