Question

true or false
The physical property of an iron blade change when it is heated to red hot.

suggest an activity to show that a heated iron rod can be reversed to its original state

Answer 1

true

take a iron ball connected to a chain pass it through a ring it passes easily
then heat the iron ball and try to pass it in the ring the ball does not pass
why??
because solid expand on heating



one more example is the railway track
there will be a gap between the track joint because in summer due to heat the iron track may expand if gap is not left then there will be a bulk in track which leads to accidents

Answer 2

it was a true because it is a iron