Q. 1. 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

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  • 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.

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