Selected MCQ

Current Question
The fine-structure constant characterizes:
  • A. Gravity strength
  • B. Electromagnetic interaction strength
  • C. Weak force
  • D. Strong force
Correct Answer: B
Explanation:
It is a dimensionless constant for EM coupling.
Related Question 1
Which constant defines thermal energy scale?
  • A. Planck constant
  • B. Boltzmann constant
  • C. Avogadro number
  • D. Gas constant
Correct Answer: B
Explanation:
(k_B) relates temperature to energy.
Related Question 2
Which structure forms spindle fibers?
  • A. Ribosome
  • B. Centrosome
  • C. Lysosome
  • D. Golgi
Correct Answer: B
Explanation:
Centrosomes organize spindle.
Related Question 3
Which structure controls gene expression?
  • A. DNA
  • B. RNA
  • C. Protein
  • D. All
Correct Answer: D
Explanation:
Regulation involves DNA, RNA, and proteins.
Related Question 4
Which thermodynamic quantity remains constant in adiabatic process?
  • A. Temperature
  • B. Pressure
  • C. Entropy (reversible case)
  • D. Volume
Correct Answer: C
Explanation:
Reversible adiabatic process is isentropic.
Related Question 5
The cosmological constant is associated with:
  • A. Gravity weakening
  • B. Dark energy
  • C. Dark matter
  • D. Nuclear force
Correct Answer: B
Explanation:
Cosmological constant models accelerated expansion.