Selected MCQ

Current Question
Net primary productivity equals gross primary productivity minus:
  • A. Herbivory
  • B. Respiration by producers
  • C. Decomposition by fungi
  • D. Sedimentation
Correct Answer: B
Explanation:
Producers retain only the energy left after their own metabolic respiration.
Related Question 1
In quantum mechanics, the commutator ([x,p]) equals:
  • A. 0
  • B. (i\hbar)
  • C. (-i\hbar)
  • D. (\hbar^2)
Correct Answer: B
Explanation:
Position and momentum operators satisfy ([x,p]=i\hbar).
Related Question 2
Which law states action equals reaction?
  • A. First law
  • B. Second law
  • C. Third law
  • D. Fourth law
Correct Answer: C
Explanation:
Newton’s third law.
Related Question 3
The primary role of ribosomes is to:
  • A. Replicate DNA
  • B. Synthesize proteins
  • C. Digest lipids
  • D. Store calcium
Correct Answer: B
Explanation:
Ribosomes translate mRNA into polypeptides.