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Asked in ETEA MDCAT 2011 2011

For all irreversible process, the entropy of the system:

Correct answer: D. increase

  • A. decreases
  • B. remains constant
  • C. is zero
  • D. increase

Explanation

The second law of thermodynamics says the entropy of an isolated system increases in every irreversible process. Entropy stays constant only in a reversible process, which is an idealisation that no real process achieves.

This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.

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About Thermodynamics

Thermal equilibrium and heat explain how temperature and energy transfer are related, while molar specific heats describe the heat required by a gas at constant volume or constant pressure. The first law connects heat supplied, work done and change in internal energy, with sign conventions kept distinct from temperature changes.

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