Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________________?

A. Decreases in all spontaneous (or irreversible) processes
B. Change during a spontaneous process has a negative value
C. Remains unchanged in reversible processes carried at constant temperature and pressure
D. All A, B. and C

A. Increases
B. Decreases
C. Remains unchanged
D. Decreases linearly

A. Zeroth
B. First
C. Second
D. Third

A. Property of the system
B. Path function
C. Point function
D. State description of a system

A. T
B. T and P
C. T, P and Z
D. T and Z

A. Isothermal
B. Adiabatic
C. Isobaric
D. Isochoric