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Question
An iron ring is heated. Which of the following statement about it is incorrect?
Options
The ring expands.
The ring almost comes to the same size on cooling.
The change in this case is reversed.
The ring changes its shape and the change cannot be reversed.
Solution
The ring changes its shape and the change cannot be reversed.
Explanation -
The ring expands on heating and comes back to its original size on cooling. The change is reversible.
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RELATED QUESTIONS
Very Short Answer Type Question:
Give two examples of reversible changes.
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 is a physical change? Explain with example.
Short Answer Type Question:
What is a chemical change? Explain with example.
A drawing sheet changes when you draw a picture on it. Can you reverse this change?
What are reversible changes?
Boojho’s sister broke a white dove, a symbol of peace, made of Plaster of Paris (POP). Boojho tried to reconstruct the toy by making a powder of the broken pieces and then making a paste by mixing water. Will he be successful in his effort? Justify your answer.
Give one example of change which occurs on mixing two substances, but cannot be reversed.
Choose the odd one out. Give a reason for your choice.
Find the odd one out. Give reason for your choice.
