Physics Fluid Dynamics PMDC Conceptual Practice
PMDC Verified Question 4 of 37
The net acceleration of a spherical body falling freely through a viscous fluid depends upon which of the following factors?
A
The density of the body.
B
The instantaneous velocity of the body.
C
The viscosity of the fluid.
D
All of the above.
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: All of the above.
Concept:

The acceleration of a body falling through a fluid is determined by Newton's Second Law, balancing gravity, buoyant force, and the drag force.

Formula:

$$ m a = m g - F_B - F_D $$

Solution:

  • The mass \( m \) is related to the density of the body.
  • The buoyant force \( F_B \) depends on fluid density and volume.
  • The drag force \( F_D \) (Stokes' drag) depends on the fluid's viscosity and the instantaneous velocity of the body.
  • Therefore, acceleration is a function of velocity, fluid viscosity, and the body's density.


Why other options are incorrect:

Options A, B, and C are incomplete. The acceleration dynamically depends on all three factors working together.

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.

Previous Question All Fluid Dynamics MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App