Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> A piece of iron is heated till it becomes red-hot, and then beaten to a desired shape. Is this a reversible or an irreversible change?

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> A piece of iron on heating can be beaten into desired shape. It is a reversible change because the object of desired shape can be again heated and beaten to give the original shape.