Physics Thermodynamics MDCAT 2019
PMDC Verified Question 49 of 54
The sum of all forms of molecular energies (kinetic and potential) of a substance is termed as?
A
Heat energy
B
Absolute energy
C
Internal energy
D
Elastic energy
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Internal energy
1. Concept:

In thermodynamics, the macroscopic properties of a system are defined by the microscopic energies of its particles. The total microscopic energy is called Internal Energy.

2. Formula:

$$U = \Sigma E_k + \Sigma E_p$$

3. Solution:

  • By definition, the internal energy (\(U\)) of a thermodynamic system is the sum of the random kinetic energies of its molecules and the potential energies associated with intermolecular forces.


4. Why other options are incorrect:

Heat is energy in transit, not energy contained within a system. Absolute energy and elastic energy do not properly describe the sum of all microscopic molecular energies.

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