Physics - Heat & Thermo Question with Solution | TestHub

Fraction submerged $f={\rho }_{Pb}/{\rho }_{Hg}$. Mercury ( $\gamma \approx 1.8\times 10^{-4}{}^{\circ }{C}^{-1}$ ) expands much more than lead ( $\gamma \approx 0.87\times 10^{-4}$ ), so its density falls faster and $f$ rises. The lead floats lower. Both are true. The Reason gives the physical cause of the Assertion. Correct option: (A).