GATE XE 2023 | Question: 89

Question

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Q. 99 & \begin{tabular}{l}
A $5 \mathrm{~kg}$ metal block $\left(c_{p}=0.5 \mathrm{~kJ} / \mathrm{kg}-\mathrm{K}\right)$ at $373 \mathrm{~K}$ is submerged into $10 \mathrm{~kg}$ of water \\
$\left(c_{p}=4.2 \mathrm{~kJ} / \mathrm{kg}-\mathrm{K}\right)$ at $293 \mathrm{~K}$ in an insulated rigid container without spilling. \\
Assuming thermal equilibrium is reached, the approximate entropy change of the \\
universe is
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• A. & $-0.565 \mathrm{~kJ} / \mathrm{K}$ \\
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• B. & $0.073 \mathrm{~kJ} / \mathrm{K}$ \\
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• C. & $0.642 \mathrm{~kJ} / \mathrm{K}$ \\
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• D. & $0.963 \mathrm{~kJ} / \mathrm{K}$
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