First Law of Thermodynamics Quiz
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Questions and Answers

Which of the following statements is consistent with the first law of thermodynamics?

  • The total entropy of an isolated system can never decrease over time.
  • Energy always flows from a colder body to a hotter body.
  • The internal energy of an isolated system remains constant.
  • Energy cannot be created or destroyed, only transformed from one form to another. (correct)

    • Which statement aligns with the first law of thermodynamics?

  • The energy content of an open system remains constant.
  • Heat added to a system increases its internal energy. (correct)
  • Work done by a system decreases its internal energy.
  • The total energy of a closed system decreases over time.

    • Which principle is in accordance with the first law of thermodynamics?

  • Energy spontaneously tends to disperse and become more chaotic.
  • The change in internal energy of a system is equal to the heat added minus the work done by the system. (correct)
  • The temperature of an ideal gas is directly proportional to its pressure.
  • The efficiency of a heat engine can never be 100%.

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