Chemistry Gases NUMS 2023
PMDC Verified Question 30 of 65
The SI unit for pressure is:
A
mm of Hg
B
Pascal
C
Bar
D
Torr
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Pascal
Concept:

The International System of Units (SI) defines standardized units for all physical quantities to ensure global scientific consistency.

Solution:

  • Pressure is fundamentally defined as Force per unit Area (\( P = \frac{F}{A} \)).


  • In SI units, Force is measured in Newtons (N) and Area is measured in square meters (\( \text{m}^2 \)).


  • Therefore, the derived SI unit for pressure is Newtons per square meter (\( \text{N/m}^2 \)).


  • This exact unit is given the derived name Pascal (Pa) in honor of Blaise Pascal.


Why other options are incorrect:

  • Options A & D: mm of Hg and Torr are manometric units historically based on the height of a mercury column. They are widely used in medicine and chemistry, but are not SI.
  • Option C: The Bar is a metric unit of pressure (100,000 Pa) favored in meteorology, but it is not the base SI unit.

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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