If $\Delta Q$ and $\Delta W$ represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as
AIIMS 2013, Easy
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From FLOT $\Delta Q=\Delta U+\Delta W$
$\because$ Heat supplied to the system so
$\Delta Q \rightarrow\, Positive$
and work is done on the system so
$\Delta \mathrm{W} \rightarrow\,Negative$
Hence $+\Delta Q=\Delta U-\Delta W$
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