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
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
The number of translational degree of freedom for a diatomic gas is
2
3
5
6
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
First law of thermodynamics is a consequence of conservation of
Work
Energy
Heat
All of these
The efficiency of a Carnot engine operating between temperatures of 100oC and -23oC will be
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
An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62oC, its efficiency is doubled. Temperature of the source is
124oC
37oC
62oC
99oC
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
Δ U1 < ΔU2
Relation between ΔU1 and ΔU2 cannot be determined.
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
