Selected MCQ

Current Question
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 1
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 2
Which metal is best conductor?
  • A. Iron
  • B. Copper
  • C. Silver
  • D. Gold
Correct Answer: C
Explanation:
Silver has highest conductivity.
Related Question 3
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.
Related Question 4
Which statement best describes a catalyst?
  • A. It changes (\Delta G) of reaction
  • B. It changes equilibrium constant
  • C. It lowers activation energy for forward and reverse reactions
  • D. It is consumed stoichiometrically
Correct Answer: C
Explanation:
A catalyst accelerates both directions equally without shifting equilibrium.
Related Question 5
In special relativity, simultaneity of two spatially separated events is:
  • A. Absolute in all inertial frames
  • B. Relative to the observer’s frame
  • C. Undefined
  • D. Conserved under Galilean transformation only
Correct Answer: B
Explanation:
Events simultaneous in one inertial frame need not be simultaneous in another.