An ideal gas is taken through the cycle A B C A as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C A is:
- 5 J
- 10 J
- 15 J
- 20 J
A diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle the volume of the has increased from V to 32 V, the efficiency of the engine is:
0.25
0.5
0.75
0.99
A system goes from A to B via two processes I and II as shown in the figure. If ΔU1 and ΔU2are the changes in internal energies in the processes I and II respectively, then
ΔU1 = ΔU2
ΔU1 > ΔU2
ΔU1 < ΔU2
relation between ΔU1 and ΔU2 cannot be determined.
In a given process of an ideal gas, dW = 0 and dQ < 0. Then for the gas:
The temperature will decrease
The volume will increase
The pressure will remain constant
The temperature will increase
In an adiabatic process, the quantity which remains constant is:
Volume
Pressure
Temperature
Total heat of the system
An ideal gas is compressed adiabatically to 8/27 times of its present value at 27oC. The temperature of the gas becomes: (γ= 5/3).
475oC
275oC
402oC
175oC
A thermodynamic process is shown in the figure. The pressure and volumes corresponding to some points in the figure are:
PA = 3 × 104 Pa, VA = 2 × 10-3 m3
PB = 8 × 104 Pa, VB = 5 × 10-3 m3
In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be
560 J
800 J
600 J
640 J
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
A thermodynamic system is taken through the cycle PQRSP process. The net work done by the system is :
20 J
-20 J
400 J
-374 J
Which one of the following is not a state function ?
Entropy
Work
