Question

9. Iron rim is made slightly smaller than the wooden wheel. The rim is
usually heated before fixing on the wooden wheel because on heating,
the Iron
a) expands and fits on the wooden wheel.
b) contracts and fits on the wooden wheel.
c) no change in size takes place.(D) expands first then contracts on cooling and hits on the wooden wheel. ​

Answer 1

Rims are heated red before fixing them because it will slips on to the wheel. When it is cooled it contracts and grips the wheel firmly...

Answer 2

Answer:

a) expand and fit on the wooden wheel