Selected MCQ

Current Question
Which gas is produced in respiration?
  • A. O₂
  • B. CO₂
  • C. N₂
  • D. H₂
Correct Answer: B
Explanation:
Respiration releases CO₂.
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
In a semiconductor, a p-type material is produced by doping silicon with:
  • A. Pentavalent atoms
  • B. Noble gases
  • C. Trivalent atoms
  • D. Isotopes of silicon only
Correct Answer: C
Explanation:
Trivalent dopants create holes as majority carriers.