Thermodynamics (Physics)

During an adiabatic process, if the pressure of a gas is found to be proportional to the cube of its absolute temperature, then the ratio of CPCV for the gas is :

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

A sample of gas at temperature T is adiabatically expanded to double its volume. Adiabatic constant for the gas is = 3/2. The work done by the gas in the process is: ( = 1 mole)

1. RT[2 2 - 1]
2. RT[2 - 2]
3. RT[1 - 2 2]
4. RT[ 2 - 2]

The pressure and volume of an ideal gas are related as PV3/2 = K (Constant). The work done when the gas is taken from state A (P1, V1, T1 ) to state B (P2, V2, T2 ) is :

1. 2 (P2 V2 - P1 V1 )
2. 2 ( P1 V1 - P2 V2 )
3. 2 (P2V2 - P1V1 )
4. 2 (P1V1 - P2V2 )

A diatomic gas ( =1.4) does 200 J of work when it is expanded isobarically. The heat given to the gas in the process is :

1. 800 J
2. 600 J
3. 700 J
4. 850 J

The given figure represents two isobaric processes for the same mass of an ideal gas, then [figure]

1. P2>P1
2. P1>P2
3. P1=P2
4. P2 P1

Two thermodynamical processes are shown in the figure. The molar heat capacity for process A and B are CA and CB. The molar heat capacity at constant pressure and constant volume are represented by CP and CV, respectively. Choose the correct statement. [figure]

1. CP>CB>CA>CV
2. CP>CV>CA=CB
3. CA=0 and CB=
4. CA= , CB=0

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