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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
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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
Short Answer Type Question:
What is a physical change? Explain with example.
Magnet attracts iron needle.This is ______ change.
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
Changes which cannot be reversed are called ______.
Evaporation of water is a reversible change.
When ‘Touch me not’ plant is touched by us, ______ changes occur.
Give one example of change which occurs on heating but cannot be reversed.
Give one example of change occurs on mixing two substances, but can be reversed.
Choose the odd one out. Give a reason for your choice.
Find the odd one out. Give reason for your choice.
