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NEET 2026 (Re-neet) · Thermometry & Thermal Expansion

Thermometry & Thermal Expansion question from NEET 2026 (Re-neet)

Q4NEET 2026 · RE-NEETEasy

Thermometry & Thermal Expansion

The temperature of a metallic sphere of radius $R$ is increased by a small amount $\Delta T$ . If the linear coefficient of thermal expansion of the metal is $\alpha$ , the approximate increase in the volume of the sphere is:

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Answer: (d)

$V=\frac{4}{3}\pi R^3$ and $\gamma=3\alpha$ .
$\Delta V=V\gamma\Delta T=\frac{4}{3}\pi R^3\times 3\alpha\Delta T=4\pi R^3\alpha\Delta T$
So the answer is (d).

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