Which of the following is the correct statement of the second law of thermodynamics?
A
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
B
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
C
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
D
All of the above
Correct Answer: All of the above
