Section 4: Soil and Water Conservation Engineering
Fluid Mechanics
Subtopic: Dimensional analysis – concepts of geometric dimensionless numbers
Question Statement:
The ratio of inertial forces to viscous forces is knows as ___________.
Options:
(A) Froude number
(B) Reynolds number
(C) Power number
(D) Biot number
Official Answer Key:
B
Step-by-Step Solution & Explanation
• Reynolds number Re = ρVL/μ = inertial force/viscous force, by definition, used to distinguish laminar from turbulent flow.
• Distractor logic: (A) Froude number = inertial/gravity forces. (C) Power number relates to mixing/agitation power draw. (D) Biot number relates internal vs surface heat-transfer resistance — none is inertial/viscous.
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