# Physics: Thermodynamics

##### 21. Question

A thermally insulted vessel contains 150 g of water at 0°C. Then the air from the vessel is pumped out adiabatically. A fraction of water turns into ice and the rest evaporates at 0°C itself. The mass of evaporated water will be closed to: (Latent heat of vaporization of water = 2.10 × 106 J kg–1 and Latent heat of Fusion of water = 3.36 × 105 J kg–1 )

##### 22. Question

Following figure shows two processes A and B for a gas. If ΔQA and ΔQB are the amount of heat absorbed by the system in two cases, and ΔUA and ΔUB are changes in internal energies, respectively, then:

##### 23. Question

n moles of an ideal gas with constant volume heat capacity CV undergoes an isobaric expansion by a certain volume. The ratio of the work done in the process, to the heat supplied is:

##### 24. Question

One mole of an ideal gas passes through a process where pressure and volume obey the relation P = P0[1 – 1/2 x (V0/V)2] Here P0 and V0 are constants. Calculate the charge in the
temperature of the gas if its volume changes from V0 to 2V0.