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WorksheetsCE 373: Common Fluid Properties (Part 1)
Total questions: 15
Worksheet time: 8mins
Which branch of mechanics deals with fluids at rest?
Dynamics
Statics
Fluid statics
Kinematics
Fluid mechanics is often referred to as fluid dynamics because:
Fluids are always in motion
Fluids at rest are treated as a special case with zero velocity
Fluids cannot be compressed
All flows are laminar
Hydrodynamics primarily studies:
Motion of gases at high speeds
Incompressible fluid motion
The structure of solids
The free surface of liquids
Which distinguishes a solid from a fluid?
Solids are heavier
Solids resist shear stress while fluids deform continuously under it
Solids cannot deform
Fluids have fixed shapes
Stress in solids is proportional to strain, but in fluids stress is proportional to:
Strain
Strain rate
Density
Pressure
Liquids are generally regarded as:
Highly compressible
Incompressible
Random in structure
Without free surface
Which property distinguishes gases from liquids?
Gases form a free surface
Gases occupy a fixed volume
Gases expand to fill the entire container
Gases resist shear stress permanently
An example of a biological application of fluid mechanics is:
Flow in open channels
Blood flow through arteries
Pump design
Sediment transport
Viscosity in liquids is mainly caused by:
Molecular collisions
Cohesive forces between molecules
Pressure differences
Shear strain
The no-slip condition in fluid mechanics means:
Fluids move faster near boundaries
Fluids stick to solid boundaries
Fluids slide without friction
No shear stress acts on surfaces
Flow in a pipe completely bounded by walls is classified as:
External flow
Internal flow
Inviscid flow
Laminar flow
Which type of flow is characterized by chaotic velocity fluctuations?
Laminar flow
Turbulent flow
Transitional flow
Compressible flow
The Reynolds number is a dimensionless parameter used to determine:
Fluid compressibility
Flow regime (laminar, turbulent, transitional)
Density of liquids
Flow velocity only
Natural convection occurs mainly due to:
Mechanical pumps
External fans
Buoyancy effects from temperature differences
Pressure gradients
A flow in which properties remain constant with time at a point is called:
Unsteady flow
Steady flow
Transitional flow
Periodic flow
