Selected MCQ

Current Question
In thermodynamics, enthalpy is defined as:
  • A. (U - PV)
  • B. (U + PV)
  • C. (PV - U)
  • D. (TS)
Correct Answer: B
Explanation:
Enthalpy is internal energy plus pressure-volume term.
Related Question 1
In thermodynamics, the Helmholtz free energy is minimized at constant:
  • A. Pressure and temperature
  • B. Volume and temperature
  • C. Volume and entropy
  • D. Pressure and entropy
Correct Answer: B
Explanation:
Helmholtz free energy applies to constant T and V systems.
Related Question 2
The Lagrangian of a system is defined as:
  • A. (T + V)
  • B. (T - V)
  • C. (V - T)
  • D. (TV)
Correct Answer: B
Explanation:
The Lagrangian equals kinetic energy minus potential energy.