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When a solid is heated and only its length is considered to change with temperature, what is this type of thermal expansion called?
AApparent expansion
BLinear expansion
CCubical expansion
DSuperficial expansion
Answer & Solution
Correct answer: B. Linear expansion
1. Expansion involving only the length of a body is called linear (longitudinal) expansion.
2. Area change is superficial expansion and volume change is cubical expansion.
3. So a change confined to length is linear expansion.
4. Apparent expansion is a term used for liquids in containers, not for a solid's length.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 3 Thermal Physics "Expansion of Substances", p.41_
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