Selected MCQ

Current Question
In general relativity, geodesics represent:
  • A. Maximum energy paths
  • B. Straightest paths in curved spacetime
  • C. Quantum trajectories
  • D. Stationary points of entropy
Correct Answer: B
Explanation:
Free-falling particles follow spacetime geodesics.
Related Question 1
In general relativity, gravity is best described as:
  • A. A force acting at a distance
  • B. Curvature of spacetime caused by mass-energy
  • C. Exchange of virtual photons
  • D. A fictitious force only
Correct Answer: B
Explanation:
Einstein’s theory models gravity as spacetime curvature influencing geodesic motion.
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
In plasma physics, Debye length represents:
  • A. Particle velocity
  • B. Screening distance of electric fields
  • C. Temperature gradient
  • D. Magnetic field strength
Correct Answer: B
Explanation:
Debye length defines electrostatic screening scale.
Related Question 4
The Hamiltonian of a system represents:
  • A. Total potential energy
  • B. Total kinetic energy
  • C. Total energy of the system
  • D. Only internal energy
Correct Answer: C
Explanation:
Hamiltonian corresponds to total energy in many systems.
Related Question 5
Which statement about electron affinity is generally correct?
  • A. It becomes less exothermic across a period
  • B. Noble gases usually have strongly negative values
  • C. Halogens tend to have highly exothermic electron affinities
  • D. It is identical to ionization energy
Correct Answer: C
Explanation:
Halogens readily gain one electron to complete their valence shell.