Physics Fluid Dynamics PMDC Conceptual Practice
PMDC Verified Question 14 of 37
When compared to the density of pure water, the density of human whole blood is:
A
Roughly 3 times greater
B
Slightly less than water
C
Nearly equal to water
D
Exactly half that of water
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Nearly equal to water
Concept:

The physical properties of bodily fluids are largely determined by their primary solvent.

Formula:

$$ \rho_{\text{blood}} \approx 1060 \text{ kg/m}^3 $$

Solution:

  • Pure water has a density of \( 1000 \text{ kg/m}^3 \).
  • Whole human blood consists mostly of water, with added cells and proteins, giving it a density of roughly \( 1050 - 1060 \text{ kg/m}^3 \).
  • This is nearly equal to (just marginally higher than) the density of pure water, so in many fluid dynamic approximations, they are treated similarly.


Why other options are incorrect:

Blood is denser than water (not less), but only by about 5-6%, completely invalidating the options suggesting it is three times greater or half.

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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