| Which of the following changes cannot be reversed? |
| (a) Blowing of a balloon |
| (b) Folding a paper to make a toy aeroplane |
| (c) Rolling a ball of dough to make roti |
| (d) Baking cake in an oven |
| (e) Drying a wet cloth |
| (f) Making biogas from cow dung |
| (g) Burning of candle |
Answer:
The changes that cannot be reversed are given as below: (a) Baking cake in an oven (f) Making biogas from cow dung (g) Burning of a candle
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