Question

mention one application of expansion on heating and contacting on cooling

Answer 1

expansion - to fit metal rim on a wooden wheel which is smaller than the wheel by heating rim.
contraction- we pour cold water over the metal rim, so it contracts and fits tightly on the wheel.

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Answer 2

heyaa..
Here's ur answer..

♡Removing tight lids

To open the cap of a bottle that is tight enough, immerse in it hot water for a minute or so. Metal cap expands and becomes loose. It would now be easy to turn it to open.and similarly on cooling it contract's and fits properly...