Question

Surbhi folded a sheet of paper, rolled it and then tore it into smaller pieces. Furthermore, she burnt those torn pieces. Identify the irreversible changes that took place in the given sequence of changes.

• A. Both folding and rolling of paper
• B. Rolling of paper
• C. Burning of paper
• D. Both tearing and burning of paper

Answer 1

The correct option is D Both tearing and burning of paper

Folding of paper as well as rolling of paper are reversible changes because folded paper can be unfolded back while the rolled paper can be unrolled back. But in both, tearing and burning of paper, the original state of the paper cannot be obtained back.

So, folding and rolling of paper are reversible changes while tearing and burning of paper are irreversible changes.