Selected MCQ

Current Question
Which principle states particles are indistinguishable?
  • A. Pauli principle
  • B. Superposition principle
  • C. Indistinguishability principle
  • D. Correspondence principle
Correct Answer: C
Explanation:
Quantum particles of same type are identical.
Related Question 1
Which principle states that identical fermions cannot occupy the same quantum state?
  • A. Heisenberg principle
  • B. Pauli exclusion principle
  • C. Hund’s rule
  • D. Aufbau principle
Correct Answer: B
Explanation:
Fermions obey antisymmetric wavefunctions prohibiting identical states.
Related Question 2
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 3
Which force acts on charged particles?
  • A. Gravitational
  • B. Magnetic
  • C. Electric
  • D. Nuclear
Correct Answer: C
Explanation:
Electric force acts on charges.
Related Question 4
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 5
The Heisenberg uncertainty principle implies:
  • A. Exact prediction possible
  • B. Simultaneous measurement limits
  • C. Deterministic motion
  • D. No probability
Correct Answer: B
Explanation:
Certain pairs cannot be measured precisely together.