H. E. Smith                                                                                                       Fall 2002

Physics 1B - Reading Quiz #3

1. In the PV diagram above, an Ideal Gas is moved along an isothermal path from "i" to "f". You know that:
   • A. Q = 0; because it is isothermal no heat is transferred to or from the system.
   • B. W > 0; work is done by the system.
   • C. W < 0; work is done on the system.
   • D. U > 0; the internal energy must increase.
   • E. U < 0; the internal energy must decrease.

2. One way of stating the Second Law of Thermodynamics is:
   • A. heat can never be transferred from a higher T system to a lower T system.
   • B. heat can never be transferred from a lower T system to a higher T system.
   • C. no process is possible which only transfers heat from a lower T system to a higher T system.
   • D. no process is possible which only transfers heat from a higher T system to a lower T system.
   • E. every change of state of an isolated system decreases its entropy (or at best leaves it unchanged).