Thermodynamics (Physics)

Choose the correct statement for processes A & B shown in figure. [figure]

1. PV=k for process B and A.
2. P -1T =k for process B and T=k for process A.
3. T P -1=k for process A and PV=k for process B.
4. PV =k for process B and PV=k for process A.

A thermodynamic system is taken from an original state A to an intermediate state B by a linear process as shown in the figure. Its volume is then reduced to the original value from B to C by an isobaric process. The total work done by the gas from A to B and B to C would be : [figure]

1. 800 J
2. 2200 J
3. 33800 J
4. 1200 J

0.08 kg air is heated at constant volume through 5 . The specific heat of air at constant volume is 0.17 kcal/kg C and J=4.18 joule/cal. The change in its internal energy is approximately.

1. 318 J
2. 298 J
3. 284 J
4. 142 J

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio of CpCv for the gas is :

1. 75
2. 32
3. 97
4. 53