Question

The increase in the length of a solid on heating is called :
(a) contraction
(b) linear expansion
(c) cubical expansion
(d) superficial expansion

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Answer

(b) linear expansion

Reason — A solid has a definite shape, so when it is heated, it expands in all directions i.e., the length, area and volume all increase on heating. The increase in the length is called linear expansion.

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