# Helium gas is heated at constant pressure by10^0 C. The percentage of heat energy supplied which is used in increasing the internal energy of the gas is? (A) 60% (B) 71% (C) 75% (D) 100%

For isobaric process ,total heat energy is expressed as $n C p \mathrm{dt}$
And internal energy as $n C v \mathrm{dt}$
So, internal energy is$\frac{n C v \mathrm{dt}}{n C p \mathrm{dt}}$ times of total energy supplied i.e $\frac{C v}{C p}$
Helium being a monoatomic gas its gamma value is $\frac{5}{3}$ = $\frac{C p}{C v}$
Hence, the percentage is $\left(\frac{3}{5}\right) \cdot 100$or 60 %