Selected MCQ

Current Question
In a relativistic particle collision, total energy is conserved but:
  • A. Mass is always conserved separately
  • B. Mass can convert into energy
  • C. Momentum is not conserved
  • D. Charge is not conserved
Correct Answer: B
Explanation:
Relativity allows interconversion of mass and energy via (E=mc^2).
Related Question 1
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 2
A particle in a one-dimensional infinite potential well has energy proportional to:
  • A. (n)
  • B. (n^2)
  • C. (1/n)
  • D. (\ln n)
Correct Answer: B
Explanation:
Energy levels scale as (n^2) in a particle-in-a-box model.
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
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.