Question

There is a rectangular metal plate in which two cavities in the shape of rectangle and circle are made, as shown with dimensions. P and Q are centres of these cavities. On heating the plate, which of the following quantities increase ?

• A. Area $\left(\pi r^2\right)$ of circular cavity
• B. Area ($ab$) of rectangular cavity
• C. Distance ($R$) between centre of both cavities
• D. Width ($b$) of rectangular cavity

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Area $\left(\pi r^2\right)$ of circular cavity
B Area ($ab$) of rectangular cavity
C Distance ($R$) between centre of both cavities
D Width ($b$) of rectangular cavity

On heating, every dimension of cavities and rectangular plate increase, so area of cavities and distance between them also increase.