Cutting your hair is a/an _____ change.

(i) reversible.

(ii) irreversible.

(iii) chemical.

(iv) physical.

Which of these changes are physical and irreversible?

(i) folding of cloths.

(ii) melting of butter.

(iii) breaking of glass.

(iv) chopping of wood.

Which of these changes are physical and reversible?

(i) burning of coal.

(ii) freezing of water.

(iii) rusting of iron.

(iv) melting of wax.