Two large holes are cut in a metal sheet. If this is heated, will their diameters increase or decrease?

Tow large holes are cut in a metal sheet. If this is heated, distances AB and BC , (as shown)

A long metal rod is bent to form a ring with a small gap if this is heated, will this gap increase or decrease?

A metallic sphere of diameter D has a cavity of diameter d at its centre. If the sphere is heated, the diameter of the cavity will:

In the above question, will the distance between the holes increase or decrease on heating?

A metal rod is shaped into a ring with a small gap. If this is heated, (i) the length of the rod will increase (ii) the gap will decrease (iii) the gap will increase (iv) the diameter gof the ring will increase in the same ratio as the blength of the rod

A metal sheet with a cricular hole in heated. The hole