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Physics Chapter 6 : Topic 3
Ideal Fluid and Streamline Flow
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An ideal fluid is one which is:
Reasoning: An ideal fluid is assumed to have no viscosity and constant density.
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The two main assumptions for an ideal fluid are:
Reasoning: Ideal fluids have constant density and no internal friction.
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In an ideal fluid, energy is lost due to friction:
Reasoning: An ideal fluid is non-viscous, so no energy is lost due to viscosity.
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Which of the following is closest to an ideal fluid assumption?
Reasoning: Water has relatively low viscosity compared with liquids like oil and honey.
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A flow is called steady when:
Reasoning: In steady flow, fluid velocity at each point does not change with time.
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In steady flow, a fluid particle follows:
Reasoning: Streamlines represent paths followed by fluid particles in steady flow.
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A streamline represents:
Reasoning: Streamlines show the direction of fluid velocity at every point.
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In streamline flow, two streamlines:
Reasoning: Intersection would mean two different velocities at the same point, which is impossible.
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The velocity of fluid particles at a given point in steady flow:
Reasoning: Constant velocity at a point defines steady flow.
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Which situation represents streamline flow?
Reasoning: Smooth and regular motion represents laminar flow.
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Laminar flow occurs when fluid particles:
Reasoning: Laminar flow consists of smooth layers without mixing.
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Turbulent flow is characterized by:
Reasoning: Turbulent flow contains eddies and irregular changes.
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Increasing the speed of fluid flow may cause:
Reasoning: High speeds can disturb streamline motion.
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Which factor helps maintain streamline flow?
Reasoning: Slow flow is more likely to remain laminar.
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Streamline flow is important because it allows us to:
Reasoning: Streamlines provide predictable fluid paths.
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An incompressible fluid is one whose:
Reasoning: Incompressible fluids maintain constant density.
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Which fluid is approximately incompressible?
Reasoning: Liquids such as water have nearly constant density.
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When pressure is applied to an incompressible fluid, its volume:
Reasoning: Incompressible fluids resist volume changes.
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Density of an incompressible fluid during flow:
Reasoning: Constant density is the defining property.
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The continuity equation for an incompressible fluid is based on conservation of:
Reasoning: Mass flow rate remains constant.
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If a pipe becomes narrower, the speed of an incompressible fluid:
Reasoning: $\mathbf{A}_{\mathbf{1\ }}\mathbf{v}_{\mathbf{1}}\mathbf{=}\mathbf{A}_{\mathbf{2\ }}\mathbf{v}_{\mathbf{2}}$ ; Smaller area requires greater velocity.
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Water flowing through a pipe is treated as incompressible because:
Reasoning: Liquids show very small compression.
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In an incompressible fluid, if velocity increases:
Reasoning: Continuity equation requires smaller area for higher speed.
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The continuity equation applies mainly to:
Reasoning: It describes conservation of mass in fluid flow.
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Viscosity of a fluid represents:
Reasoning: Viscosity is the friction between fluid layers.
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A non-viscous fluid has:
Reasoning: Non-viscous means viscosity is zero.
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In a non-viscous fluid:
Reasoning: Absence of viscosity prevents energy dissipation.
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Which fluid has greater viscosity?
Reasoning: Honey has stronger internal resistance.
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Viscous forces oppose:
Reasoning: Viscosity resists relative motion between layers.
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A perfect ideal fluid must have:
Reasoning: These are the assumptions of an ideal fluid.
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In steady flow, fluid velocity:
Reasoning: Velocity may vary from point to point but not with time at one point.
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A fluid flowing smoothly in a pipe without mixing is:
Reasoning: Smooth layers indicate laminar flow.
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The main difference between ideal and real fluids is:
Reasoning: Real fluids possess viscosity.
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Which assumption allows Bernoulli’s equation to be applied simply?
Reasoning: Bernoulli’s equation assumes steady, incompressible, non-viscous flow.
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If streamlines become irregular and mixed, the flow becomes:
Reasoning: Irregular mixing indicates turbulence.
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The motion of an ideal fluid is generally considered:
Reasoning: Ideal fluid assumptions simplify fluid motion analysis.
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