### Physics 1B Thermal Physics & Electromagnetism

`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).