Which of the following is not a thermodynamic coordinate?
P
V
T
R
Calculate the work done if temperature is changed from 0oC to 200oC at one atmosphere:(R = 2 calK-1).
100 cal
200 cal
400 cal
800 cal
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 is correct ?
In an isobaric process, ΔP = 0
In an isochoric process, ΔW = 0
In an isothermal process, ΔT = 0
In an isothermal process, ΔQ = 0
When a system is taken from the initial state i to final state f along he path iaf, it is found that Q = 50 cal and W = 20 cal. If along the path ibf, Q = 36 cal, then W along the path ibf is:
6 cal
16 cal
66 cal
14 cal
A gas at state A changes to state B through path I and II shown in figure. The changes in internal energy are ΔU1 and ΔU2 respectively. Then
Δ U1 > ΔU2
Δ U1 < ΔU2
Δ U1 = ΔU2
Δ U1 = ΔU2 = 0
An ideal gas heat engine is operating between 227oC and 127oC. It absorbs 104 J of heat at the higher temperature. The amount of heat converted into work is:
2000 J
4000 J
8000 J
5600 J
One mole of a monoatomic gas is heated at a constant pressure of 1 atmosphere from 0 K to 100 K. If the gas constant R = 8.32J/mol K, the change in internal energy of the gas is approximately :
2.3 J
46 J
8.67 x 103 J
1.25 x 103 J
The efficiency of a Carnot engine is 50% and temperature of the sink is 500 K. If the temperature of source is kept constant and its efficiency is to be raised to 60%, then the required temperature of the sink will be:
600 K
500 K
400 K
100 K
5.6 litre of helium gas at STP is adiabatically compressed to 0.7 litre. Taking the initial temperature to be T1, the work done in the process is: