Iron rims are heated red hot before planting on car wheels. Why?

Boric acid heated to red hot gives

Rekha went to her grandfather’s village for vacation. She saw bullock cart got struck in wet mud and the driver was not able to push it out by himself. Rekha ran to his help and together they pushed it out, but the iron rim of the wheel came out. They tried to put it on the wheel but it was smaller than the diameter of wheel. Suddenly she collected some wood and set them on fire and heated the rim and it slipped on the wheel. (i) What nature is shown by Rekha ? (ii) (ii) Name the property of solid used here ?

Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim

A rear wheel drive car accelerates quickly from rest, and the driver observes. that the car noses up. Why does it do that ? Would a front wheel drive car do that ?

Orthoboric acid when heated to red hot gives :

We observe that the wheels of buses and trucks are heavier than the wheels of car or scooter. Why?

In riveting boiler plates, red hot rivets are used. Why ?

When one end of an iron rod is heated, its other end also becomes hot soon. Name the process by which heat flows in the iron rod

When silver nitrate is heated to red hot, what is formed