Q10. A mixture of one mole of monoatomic gas and one mole of a diatomic gas (rigid) are kept at room temperature $\left( 27 ^ { \circ } \mathrm { C } \right)$. The ratio of specific heat of gases at constant volume respectively is:\\
(1) $\frac { 7 } { 5 }$\\
(2) $\frac { 3 } { 5 }$\\
(3) $\frac { 5 } { 3 }$\\
(4) $\frac { 3 } { 2 }$