# NEET Physics Thermodynamics Questions Solved

When an ideal monoatomic gas is heated at constant pressure, fraction of heat energy supplied which increases the internal energy of gas, is

(1) $\frac{2}{5}$

(2) $\frac{3}{5}$

(3) $\frac{3}{7}$

(4) $\frac{3}{4}$

(2) For monoatomic gas

$\gamma =\frac{{C}_{P}}{{C}_{V}}=\frac{5}{3}$ we know $\Delta Q=n{C}_{P}\Delta T$

and $\Delta U=n{C}_{V}\Delta T$$\frac{\Delta U}{\Delta Q}=\frac{{C}_{V}}{{C}_{P}}=\frac{3}{5}$

i.e. fraction of heat energy to increase the internal energy be 3/5.

Difficulty Level:

• 22%
• 53%
• 24%
• 3%
Crack NEET with Online Course - Free Trial (Offer Valid Till August 25, 2019)