First law of thermodynamics is a consequence of conservation of
Work
Energy
Heat
All of these
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
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
We consider a thermodynamic system. If ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true?
ΔU = - W in an adiabatic process
ΔU = W in an isothermal process
ΔU = - W in an isothermal process
ΔU = W in an adiabatic process
Which of the following is not a thermodynamic coordinate?
P
V
T
R
The equation of state for 5g of oxygen at a pressure p and temperature T, when occupying a volume V, will be
pV = (5/32)RT
pV = 5 RT
pV = (5/2)RT
pV = (5/16)RT
Which statement is incorrect ?
All reversible cycles have same efficiency.
Reversible cycle has more efficiency than an irreversible one.
Carnot cycle is a reversible one.
Carnot cycle has the maximum efficiency of all the cycles.
110 J of heat is added to a gaseous system, whose internal energy is 40 J, then the amount of external work done is
150 J
70 J
110 J
40 J
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
The internal energy change, when a system goes from state A and B is 40 kJ mole-1. If the system goes from A to B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy ?
40 kJ
> 40 kJ
< 40 kJ
zero
