$\begin{array}{1 1}(A)\;1\%\\(B)\;2\%\\(C)\;5\%\\(D)\;7\%\end{array} $

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As $B=\large\frac{P}{\Delta V/V}$

$\large\frac{\Delta V}{V}=\frac{P}{B}$

Given $B=2\times 10^9N/m^2$

$P=Sgh$

$\;\;\;=10^3\times 10\times 4\times 10^3$

$\;\;\;=4\times 10^7N/m^2$

$\large\frac{\Delta V}{V}=\frac{4\times 10^7}{2\times 10^9}$

$\Rightarrow 2\times 10^{-2}$

$\Rightarrow 2$%

Hence (B) is the correct answer.

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