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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
Circle the odd one.
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Water on ______ changes to ice and on ______ comes back to water.
Can we reverse the following change? If yes, suggest the name of the method.
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Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
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.
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.
Circle the odd one out. Give reason for your choice.
