Selected MCQ

Current Question
Which scale is logarithmic and used to describe earthquake magnitude?
  • A. Beaufort scale
  • B. Mohs scale
  • C. Richter-type magnitude scale
  • D. Saffir-Simpson scale
Correct Answer: C
Explanation:
Earthquake magnitude scales quantify released energy logarithmically.
Related Question 1
Which gas is used in respiration?
  • A. CO₂
  • B. O₂
  • C. N₂
  • D. H₂
Correct Answer: B
Explanation:
Oxygen is required.
Related Question 2
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 3
Which boundary causes earthquakes?
  • A. Divergent
  • B. Convergent
  • C. Transform
  • D. All
Correct Answer: D
Explanation:
All plate boundaries can generate earthquakes.
Related Question 4
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 5
Which gas is used in photosynthesis?
  • A. O₂
  • B. CO₂
  • C. N₂
  • D. H₂
Correct Answer: B
Explanation:
CO₂ is fixed into glucose.