Selected MCQ

Current Question
In quantum field theory, virtual particles arise due to:
  • A. Violation of conservation laws
  • B. Heisenberg uncertainty principle
  • C. Thermal fluctuations only
  • D. Classical mechanics
Correct Answer: B
Explanation:
Energy-time uncertainty allows temporary particle-antiparticle fluctuations.
Related Question 1
In quantum electrodynamics, the interaction between charged particles is mediated by:
  • A. Gluons
  • B. Photons
  • C. Gravitons
  • D. W bosons
Correct Answer: B
Explanation:
Electromagnetic interactions occur via exchange of virtual photons.
Related Question 2
In molecular orbital theory, antibonding orbitals have:
  • A. Lower energy
  • B. Higher energy
  • C. Same energy
  • D. Zero energy
Correct Answer: B
Explanation:
Antibonding orbitals destabilize molecule.
Related Question 3
The Berry phase arises due to:
  • A. Dissipation
  • B. Cyclic adiabatic evolution
  • C. Thermal fluctuations
  • D. Measurement collapse
Correct Answer: B
Explanation:
Geometric phase accumulates during cyclic parameter evolution.
Related Question 4
In a Hilbert space formulation of quantum mechanics, physical states are represented by:
  • A. Real numbers
  • B. Vectors up to a global phase
  • C. Scalars only
  • D. Matrices only
Correct Answer: B
Explanation:
States are rays in Hilbert space, invariant under global phase.
Related Question 5
Which force acts on charged particles?
  • A. Gravitational
  • B. Magnetic
  • C. Electric
  • D. Nuclear
Correct Answer: C
Explanation:
Electric force acts on charges.