Selected MCQ

Current Question
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 1
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 2
In a relativistic framework, mass-energy equivalence is expressed as:
  • A. (E = mc)
  • B. (E = mc^2)
  • C. (E = \frac{1}{2}mv^2)
  • D. (E = hv)
Correct Answer: B
Explanation:
Einstein showed mass can be converted into energy via (E=mc^2).
Related Question 3
Which energy source is sustainable?
  • A. Coal
  • B. Oil
  • C. Solar
  • D. Gas
Correct Answer: C
Explanation:
Solar is sustainable.
Related Question 4
Which energy is motion?
  • A. Potential
  • B. Thermal
  • C. Kinetic
  • D. Chemical
Correct Answer: C
Explanation:
Motion defines kinetic energy.
Related Question 5
Which metal is corrosion resistant?
  • A. Iron
  • B. Aluminum
  • C. Copper
  • D. Zinc
Correct Answer: B
Explanation:
Aluminum forms protective oxide.