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प्रश्न
Which of the following change cannot be reversed?
विकल्प
Hardening of cement
Freezing of ice cream
Opening a door
Melting of chocolate
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उत्तर
Hardening of cement
Explanation:
Hardening of cement is cannot be reversed because once hardened it cannot come back to its original shape.
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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 |
Short Answer Type Question:
What happens when sugar is heated?
Circle the odd one.
The burning of the paper is an irreversible change.
Can we reverse the following change? If yes, suggest the name of the method.
Water into water vapour
Can we reverse the following change? If yes, suggest the name of the method.
Water vapour into water
Change of a bud into a flower is a change which cannot be reversed. Give four more such example.
Paheli mixed flour and water and
- made a dough,
- rolled the dough to make a chapati,
- baked the chapati on a pan,
- dried the chapati and ground it in a grinder to make powder.
Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.
Find the odd one out and give reason for your choice.
Choose the odd one out. Give reason for your choice.
