Question

Two spheres of the same size are made of the same metal, but one is hollow and the other is solid. They are heated upto the same temperature. Then,

• A. the hollow sphere will expand more
• B. the solid sphere will expand more
• C. both spheres will expand almost equally
• D. only the solid sphere will expand

Answer 1

The correct option is C both spheres will expand almost equally

Both expand the same because they have the same coefficient of thermal expansion ($\alpha$) and the same change in temperature ($\Delta T$)