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 Burning of a candle
ScienceClass 6CBSEAnswered 27 Mar 2026
Answer
- Solution:
The following changes cannot be reversed:
(d) Baking of a cake is irreversible.
(f) Making biogas from cow dung is irreversible.
(g) Burning of a candle is irreversible.