Selected MCQ

Current Question
Which system has maximum entropy?
  • A. Perfect crystal at 0 K
  • B. Completely random system
  • C. Ideal gas at absolute zero
  • D. Vacuum
Correct Answer: B
Explanation:
Maximum disorder corresponds to maximum entropy.
Related Question 1
Which statement about entropy is correct for an isolated system?
  • A. It always decreases
  • B. It remains zero
  • C. It cannot decrease in spontaneous processes
  • D. It depends only on pressure
Correct Answer: C
Explanation:
The second law states entropy of an isolated system does not spontaneously decrease.
Related Question 2
A system with negative heat capacity is characteristic of:
  • A. Ideal gas
  • B. Black holes and self-gravitating systems
  • C. Solids
  • D. Liquids
Correct Answer: B
Explanation:
Adding energy can decrease temperature in gravitational systems.
Related Question 3
Which system controls reflex?
  • A. Digestive
  • B. Nervous
  • C. Respiratory
  • D. Circulatory
Correct Answer: B
Explanation:
Nervous system handles reflexes.
Related Question 4
Which law defines entropy change in irreversible processes?
  • A. First law
  • B. Second law
  • C. Third law
  • D. Zeroth law
Correct Answer: B
Explanation:
Entropy increases in irreversible processes.
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.