# Some amount of heat given to a gas under isothermal conditions will result in

$\begin{array}{1 1}(a)\;\text{doing external work}\\(b)\;\text{a temperature rise}\\(c)\;\text{doing external work and change in temperature}\\(d)\;\text{ an increase in internal energy of the gas}\end{array}$

Explanation :
$\bigtriangleup T=0\;$ . Hence b ,c and d are not possible .
$dQ=dw.$