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  4. 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 ?

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Q. 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 ?Physics Question Image

Thermal Properties of Matter

Solution:

When a body is heated all dimension of the material as well as the enclosed lengths, areas and volumes also increase