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प्रश्न
Which of the following changes cannot be reversed?
- Blowing of a balloon
- Folding paper to make a toy aeroplane
- Rolling a ball of dough to make roti
- Baking cake in an oven
- Drying a wet cloth
- Making biogas from cow dung
- Burning of a candle
उत्तर
The following changes are irreversible-
(d) Baking cake in an oven,
(f) Making biogas from cow dung.
(g) Burning of a candle.
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संबंधित प्रश्न
Very Short Answer Type Question:
Give two examples of reversible changes.
Long Answer Type Question:
Explain how a metal rim slightly smaller than a wooden wheel can be fixed on it.
When a candle is lit the following changes are observed.
- Wax melts.
- Candle keeps burning.
- The size of the candle decreases.
- The molten wax solidifies
- Which of the changes can be reversed? Justify your answer
What are irreversible changes?
An iron ring is heated. Which of the following statement about it is incorrect?
A piece of iron is heated till it becomes red-hot. it then becomes soft and is beaten to a desired shape. What kind of changes are observed in this process-reversible or irreversible?
Can we reverse the following change? If yes, suggest the name of the method.
Ice into water
Give one example of change occurs on mixing two substances, but can be reversed.
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.
Circle the odd one out. Give a reason for your choice.
