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# An ideal gas expands in volume from $1 \times 10^{-3} m^3$ to $1 \times 10^{-2} m^3$ at $300\;K$ against a constant pressure of $1 \times 10^{5}Nm^{-2}$. The work done is

$\begin{array}{1 1}(A)\;-900\;j \\(B)\;900\;kj \\(C)\;2780\;kj \\ (D)\;-900\;kj \end{array}$

The work done is $-900\;kj$
Hence D is the correct answer.