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Which of the following change cannot be reversed?- Hardening of cement
- Freezing of ice cream
- Opening a door
- Melting of chocolate
Correct Answer: (a) Hardening of cement
Explanation: Hardening of cement is irreversible because once hardened, the cement cannot come back to its original shape.
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- Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
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- Melting of ice is which change?
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- Wool fibre cannot be obtained from which of the following?GoatLlamaAlpacaMoth
- Pick the change that can be reversed from the following.Cutting of treesMelting of gheeBurning of candleBlooming of flower
- Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates aphysical change that can be reversedchemical change that can be reversedphysical change that cannot be reversedchemical change that cannot be reversed.
- Which of the following effect cannot be produced by an unbalanced force acting on a body?$(a)$. change in speed of the body$(b)$. change in shape of the body$(c)$. change in direction of motion of the body$(d)$. change in state of rest of the body
- How is the melting Of ice, a physical change?
- An iron ring is heated. Which of the following statement about it is incorrect?(a) The ring expands.(b) The ring almost comes to the same size on cooling.(c) The change in this case is reversed.(d) The ring changes its shape and the change cannot be reversed.
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