試題詳解

複選題
25. Which of the following is a statement or a consequence of 2nd law of thermal dynamics?
(A) The efficiency of any heat engine operates between two heat reservoir is less or equal to the Carnot engine.
(B) Heat can never pass from a colder to a warmer body without some other changes occurring at the same time.
(C)Entropy of an object always increases when it is in contact with a heat reservoir.
(D) Isolated perpetual motion machine is not possible.
(E) The entropy of a thermal system going through a cyclic process always increases or stays the same after a full cycle.