Selected MCQ

Current Question
The partition function (Z) is related to Helmholtz free energy (F) by:
  • A. (F = kT \ln Z)
  • B. (F = -kT \ln Z)
  • C. (F = Z/kT)
  • D. (F = k/Z)
Correct Answer: B
Explanation:
Helmholtz free energy derives from partition function logarithm.
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 work function of a metal is the minimum energy required to:
  • A. Move electrons inside metal
  • B. Remove an electron from surface
  • C. Excite nucleus
  • D. Ionize gas
Correct Answer: B
Explanation:
Work function is threshold energy for electron emission.
Related Question 3
The partition function in statistical mechanics encodes:
  • A. Only energy levels
  • B. All thermodynamic information
  • C. Only entropy
  • D. Only pressure
Correct Answer: B
Explanation:
Thermodynamic quantities can be derived from the partition function.
Related Question 4
Which energy source is sustainable?
  • A. Coal
  • B. Oil
  • C. Solar
  • D. Gas
Correct Answer: C
Explanation:
Solar is sustainable.
Related Question 5
Which energy is motion?
  • A. Potential
  • B. Thermal
  • C. Kinetic
  • D. Chemical
Correct Answer: C
Explanation:
Motion defines kinetic energy.