First Law of Thermodynamics Quiz

• 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)

• 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.

• 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%.