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Question
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
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Solution
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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Short Answer Type Question:
What happens when sugar is heated?
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 |
Circle the odd one.
Choose the odd one out. Give reason for your choice.
Inflating a balloon, popping a balloon, fading of wall paint, burning of kerosene
Analogy:
Irreversible change: Making idly front batter.
Reversible change: ______.
Touch me not plant: ______:: digestion of food: Irreversible change.
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?
Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?
Can we reverse the following change? If yes, suggest the name of the method.
Ice into water
Choose the odd one out. Give reason for your choice.
