Book Description

5.1 The Concept of Heat Workbook Multiple Choice Questions 1.

Which of the following best defines heat in physics? (A) The degree of hotness or coldness of a body. (B) The total kinetic energy of molecules in a substance. (C) Energy in transit due to a temperature difference. (D) A property possessed by an object. Answer: (C) Explanation: Heat is specifically defined as energy transferred from a hotter object to a colder object due to their temperature difference.

Temperature (A) is a measure of average kinetic energy.

Internal energy (related to B) is the total energy within a substance.

Heat is not a property possessed by an object (D) but rather energy in transfer. 2.

Internal energy of a substance is the sum of: (A) Only the kinetic energy of its molecules. (B) Only the potential energy of its molecules. (C) Kinetic and potential energies of its molecules. (D) Heat and work done on the substance. Answer: (C) Explanation: Internal energy encompasses all forms of energy within the substance at the molecular level, including kinetic energy (translational, rotational, vibrational) and potential energy (due to intermolecular forces).

Heat and work (D) are ways to change internal energy, not components of it..

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