Chemistry Gases DUHS 2024
PMDC Verified Question 12 of 65
Low atmospheric pressure system is called: (Out of Syllabus)
A
Diffusion
B
Depression
C
Effusion
D
Contraction
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Depression
Concept:

This is a geography/meteorology question related to atmospheric pressure states, rather than pure chemical thermodynamics.

Solution:

  • In meteorology, a region where the atmospheric pressure is significantly lower than the surrounding area is formally called a depression (or a low-pressure area / cyclone).


  • Depressions usually result in cloud formation, wind, and precipitation.


  • Note: The source document's answer key erroneously lists "C" (Effusion) for this question. However, effusion is a chemical kinetic process where gas escapes through a pinhole. The scientifically and geographically correct term is Depression.


Why other options are incorrect:

  • Options A & C: Diffusion and Effusion are molecular kinetic processes of gases, completely unrelated to macroscopic weather systems.
  • Option D: Contraction refers to a decrease in volume, not an atmospheric weather state.

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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