During an isothermal expansion, a confined ideal gas does $-150 \,J$ of work against its surroundings. This implies that
AIPMT 2011, Easy
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$150 \mathrm{J}$ of heat has been added to the gas
From the first law of thermodynamics
$\Delta \mathrm{U}=\mathrm{Q}+\mathrm{W}$
For isothermal process, $\Delta U=0$
therefore, $Q=-w$
Given $\mathrm{W}=-150$
Therefore, $Q=+150$
When $Q$ is positive, the heat is added to the gas.
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