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A liquid is heated in a container. The level first falls and then rises. Which statement about its real and apparent expansion is correct?
AApparent expansion does not depend on the container
BApparent expansion is always greater than real expansion
CReal expansion is always greater than apparent expansion
DReal and apparent expansion are always equal
Answer & Solution
Correct answer: C. Real expansion is always greater than apparent expansion
1. The container expands first, so part of the heat is spent expanding it.
2. Apparent expansion ignores the container's expansion and so appears smaller.
3. Real expansion accounts for the liquid's true rise and is therefore larger.
4. So real expansion is always greater than apparent expansion; the equality and reversed options are wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 3 Thermal Physics "Real and Apparent Expansion", p.43_
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