The volume (V) versus temperature (T) graphs for a certain amount of a perfect gas at two pressures P1 and P2are shown in the figure. It follows from the graph :
P1 > P2
P1 < P2
P1 = P2
information is insufficient to draw any conclusion.
If cp and cv denote the specific heat of nitrogen per unit mass at constant pressure and constant volume respectively, then:
cp - cv = R/28
cp - cv = R/14
cp - cv = R
cp - cv = 28R
Which is an intensive property ?
volume
mass
refractive index
weight
The number of translational degree of freedom for a diatomic gas is:
2
3
5
6
In an adiabatic process, the state of a gas is changed from P1, V1, T1 to P2, V2, T2. Which of the following relations is correct ?
An ideal monoatomic gas is taken around the cycle ABCDA as shown in the PV diagram. The work done during the cycle is given by:
1/2 PV
PV
2 PV
4 PV
The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is:
8900 J
6400 J
5400 J
7900 J
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is:
1/3
1/2
2/3
1/4
Which of the following is incorrect regarding the first law of thermodynamics ?
It introduces the concept of the internal energy
It introduces the concept of the entropy
It is not applicable to any cyclic process
It is restatement of the principle of conservation of energy
Initial pressure and volume of a gas are P and V respectively. First the gas is expanded isothermally to 4V and then its volume is made V by adiabatic process. Its final pressure (γ = 1.5) is:
8 P
4 P
P
2 P
