Question

A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will A) increase B) decrease C) remain unaffected D) have its shape changed

Answer 1

Answer: A) increase

Explanation:

The metal ball can be considered  to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase

Answer 2

$\bf{\huge{\underline{Question}}}$

A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will A) increase B) decrease C) remain unaffected D) have its shape changed.

$\bf{\huge{\underline{Answer}}}$

Due to the coefficient of volume expansion, if the ball is heated then it will expand at free surface, so the ball will expand at outer and inner both surface. Hence, the volume of cavity which is inside the ball decreases.

$\bf{\red{\underline{Answer}:}}$ (B) decrease