Chemistry Thermochemistry NUMS 2023
PMDC Verified Question 33 of 81
Which of the following is not a state function?
A
Pressure (P)
B
Temperature (T)
C
Volume (V)
D
Work (W)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Work (W)
Concept:

State functions are macroscopic properties that depend only on the current state of a system. Path functions depend on the specific sequence of steps taken to transition between states.

Solution:

  • Pressure, Temperature, and Volume define the exact thermodynamic coordinate of a system. They are classic state functions.


  • Work (W) is energy transferred due to an applied force over a distance (like a piston expanding). The amount of work done drastically changes depending on whether the expansion was done reversibly (maximum work) or irreversibly.


  • Therefore, Work is a path function, not a state function.


Why other options are incorrect:

P, T, and V are universally recognized as fundamental thermodynamic state functions.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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