# Heat supplied to a gas at constant pressure is utilised to

$(a)\;increase\;internal\;energy\qquad(b)\;to\;external\;work\;against\;pressure\qquad(c)\;either\;(a)\;or\;(b)\qquad(d)\;both\;(a) \;and\;(b)$

Answer : both (a) and (b)
Explanation :
$dQ = du + pdv$
$\bigtriangleup Q =\bigtriangleup u + p \bigtriangleup v$
Since there is a change in temperature , $\;\bigtriangleup u\;$ changes .
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