Selected MCQ

Current Question
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 1
Which metal is best conductor?
  • A. Iron
  • B. Copper
  • C. Silver
  • D. Gold
Correct Answer: C
Explanation:
Silver has highest conductivity.
Related Question 2
Which tensor describes spacetime curvature?
  • A. Maxwell tensor
  • B. Riemann tensor
  • C. Stress tensor
  • D. Metric tensor only
Correct Answer: B
Explanation:
Riemann curvature tensor quantifies spacetime curvature.
Related Question 3
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 4
Which statement about radiometric dating is correct?
  • A. It depends on constant atmospheric pressure
  • B. It uses known decay rates of radioactive isotopes
  • C. It works only on sedimentary rocks directly
  • D. It requires fossils in all samples
Correct Answer: B
Explanation:
Isotopic parent-daughter ratios and decay constants allow age estimation.
Related Question 5
Which statement is correct for a buffer solution?
  • A. It resists all pH changes regardless of added amount
  • B. It contains a strong acid and strong base in equal amounts
  • C. It resists pH change upon small addition of acid or base
  • D. Its pH is always 7
Correct Answer: C
Explanation:
Buffers work through conjugate acid-base pairs that neutralize small perturbations.