A solid is immersed completely in a liquid. The temperature coefficients of volume expansion of solid and the liquid are ${\gamma }_1$ and ${\gamma }_2\left(<{\gamma }_1\right)$ If temperatures of both are increased, then match the following.

Upthrust $\mathrm{F}={\mathrm{V}}_{\mathrm{s}}{\mathrm{\rho }}_1\mathrm{g}$ 

( $V_{s }$=Volume of solid immersed, ${\rho }_1=$ density of liquid) with increase in temperature, as the volume increases the upward thrust also increases.

As a result of increased upthrust the apparent weight of the body will decrease.

As a result of increase in temperature the density of solid and also the liquid decreases. But since ${\gamma }_1>{\gamma }_2$ the decrease in density of solid is more dominating. 

Further fraction of volume immersed will decrease on increasing the temperature.