Selected MCQ

Current Question
Which gas is most abundant greenhouse gas?
  • A. CO₂
  • B. CH₄
  • C. H₂O vapor
  • D. O₃
Correct Answer: C
Explanation:
Water vapor dominates greenhouse effect.
Related Question 1
Which gas contributes most to greenhouse effect after water vapor?
  • A. Methane
  • B. CO₂
  • C. Ozone
  • D. Nitrogen
Correct Answer: B
Explanation:
CO₂ is major anthropogenic greenhouse gas.
Related Question 2
Which compound is most polar?
  • A. CO₂
  • B. CH₄
  • C. NH₃
  • D. BF₃
Correct Answer: C
Explanation:
NH₃ has net dipole moment.
Related Question 3
Which phase produces ATP most?
  • A. Glycolysis
  • B. Krebs cycle
  • C. Electron transport chain
  • D. Fermentation
Correct Answer: C
Explanation:
Oxidative phosphorylation yields most ATP.
Related Question 4
Which compound is most soluble in water?
  • A. Benzene
  • B. NaCl
  • C. CH₄
  • D. CCl₄
Correct Answer: B
Explanation:
Ionic compounds dissolve well.
Related Question 5
Which process increases entropy most?
  • A. Freezing water
  • B. Mixing gases
  • C. Crystallization
  • D. Condensation
Correct Answer: B
Explanation:
Mixing increases randomness.