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Q)

A block of wood floats in water with $\large\frac{4}{5}$ th of its volume submerged , but it just floats in a liquid . What is the density of the liquid ?

$\begin{array}{1 1} 750\;kg m^{-3} \\ 800 \;kg\;m^{-3} \\ 1000\;kg m^{-3} \\ 1250\;kg m^{-3} \end{array}$

$\rho _1= \rho \times \large\frac{v}{4/5v}$
$\qquad= \frac{5}{4}$$e \rho _2= \rho \times \large\frac{v}{v} \qquad=\rho \rho _1=\large\frac{5}{4}$$ \rho _2$
$\rho _2=\large\frac{4}{5}$$\times 1000$
$\qquad= 800 \;kg\;m^{-3}$
Answer: $800 \;kg\;m^{-3}$