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WorksheetsWeek 1: Intro to FS
Total questions: 12
Worksheet time: 6mins
Which statement best defines a fluid?
A substance that deforms continuously under any applied shear stress
A substance that instantly returns to its original shape when shear is removed
A rigid body that completely resists deformation
A substance that cannot transmit pressure in all directions
An incompressible fluid is one whose _____ stays essentially constant when pressure changes.
Density
Viscosity
Temperature
Surface tension
When may the flow of a compressible fluid (e.g., air) be treated as incompressible?
When density changes is negligible, e.g. Ma < 0.3
Whenever velocity exceeds speed of sound
Only at very high pressure
Never; it must always be treated as compressible
What is the primary characteristic of a viscous fluid?
It can be compressed easily
It resists flow and deformation
It has a constant density regardless of pressure
It flows freely without resistance
Which of the following best describes a Newtonian fluid?
Its viscosity remains constant regardless of the shear rate
Its viscosity changes with the shear rate
It does not flow under any conditions
It is a solid at room temperature
What is the effect of temperature on the viscosity of a liquid fluid?
Viscosity fluctuates randomly with temperature
Temperature has no effect on viscosity
Viscosity increases as temperature increases
Viscosity decreases as temperature increases
The flow of air over an aircraft wing is classified as…
Internal flow
External flow
Open‑channel flow
Natural convection
Which description matches an open system?
Volume is fixed and mass may cross
Mass cannot cross but energy can
Mass and energy cannot cross the boundary
Mass can cross the boundary; energy transfer is permitted
Which description matches a closed system?
Mass can cross the boundary; energy transfer is permitted
Fixed mass; no mass crosses the boundary but energy may
Fixed volume; mass may cross
Variable mass; energy cannot cross
What phenomenon occurs when a liquid rises or falls in a narrow tube due to surface tension?
Viscosity
Surface tension
Hydrostatic pressure
Capillary action
Which of the following factors does NOT affect surface tension in liquids?
Temperature
Molecular structure
Impurities
Density
How does the surface tension of water compare to that of mercury?
Surface tension is not applicable to either liquid
Water has a higher surface tension than mercury
Mercury has a higher surface tension than water
Both have equal surface tension
