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प्रश्न
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.
उत्तर
- Making of dough from flour and water is irreversible change.
- Rolling the dough to make a chapati is reversible change.
- Baking the rolled chapati on a pan is irreversible change.
- Grinding of dried chapati in a grinder is irreversible change.
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संबंधित प्रश्न
Very Short Answer Type Question:
Give two examples of reversible changes.
Very Short Answer Type Question:
Can you say deforestation is an irreversible or reversible change?
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 |
Chemical reactions are example for
Match the following.
| Bud to flower | Dr. A.P.J. Abdul Kalam |
| Reversible change | Recyclable waste |
| India 2020 | Organic waste |
| Paper | Melting of ice |
| Vegetables | Irreversible change |
Differentiate reversible and irreversible reactions.
A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Rolling of chapati and baking of chapati are the changes that
Can we reverse the following change? If yes, suggest the name of the method.
Curd into milk
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.
