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प्रश्न
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?
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उत्तर
On immersing in hot water, the metal cap expands in size hence it can be removed easily.
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संबंधित प्रश्न
Short Answer Type Question:
What is a physical change? Explain with example.
Differentiate reversible and irreversible changes.
Burning of match stick is a reversible change.
Analogy
Curdling of milk : irreversible change :: Formation of clouds : ________change
Choose the odd one out. Give reason for your choice.
Inflating a balloon, popping a balloon, fading of wall paint, burning of kerosene
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Pick the change that can be reversed from the following.
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
Give one example of change which occurs on cooling but can be reversed.
Choose the odd one out. Give a reason for your choice.
