Question

A and B are made up of an isotropic medium. Both A and B are of equal volume. Body B has cavity as shown in figure b. Which of the following statements is true?

• A. expansion in volume of A > expansion in B
• B. expansion in volume of B > expansion in A
• C. expansion in A $=$ expansion in B
• D. none of these

Answer 1

The correct option is C expansion in A $=$ expansion in B

The expression of thermal expansion for an isotropic body is $\Delta V=V\gamma \Delta T$.

It is clear from this expression that the expansion is independent of shape and size of the body. It only depends upon the original volume and the material of body.

Answer is option C.