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Physics Chapter 6 : Topic 8
Viscosity of Real Fluids
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Real fluids are considered viscous because they:
Reasoning: Real fluids have internal friction that opposes the motion of different layers.
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Viscosity is the property of a fluid that describes its:
Reasoning: Viscosity measures resistance between moving fluid layers.
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Which of the following is a viscous fluid?
Reasoning: All real fluids, including water, possess viscosity.
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An ideal fluid differs from a real fluid because an ideal fluid:
Reasoning: Ideal fluids are assumed to have no internal friction.
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The main cause of viscosity in fluids is:
Reasoning: Molecular interactions resist relative motion between fluid layers.
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Viscosity occurs when:
Reasoning: Different speeds of layers produce internal friction.
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In a flowing liquid, faster layers transfer momentum to slower layers due to:
Reasoning: Molecules exchange momentum, creating viscous resistance.
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The force responsible for resisting motion between fluid layers is called:
Reasoning: Viscous force opposes relative motion between layers.
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When a fluid flows through a pipe, viscosity causes:
Reasoning: Viscosity opposes fluid motion.
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Honey flows slower than water because honey has:
Reasoning: Higher viscosity produces greater resistance to flow.
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According to the concept of viscosity, adjacent fluid layers:
Reasoning: Interaction between layers produces viscous forces.
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In a viscous fluid flowing through a pipe, the velocity is maximum:
Reasoning: The wall produces maximum friction, slowing nearby layers.
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The layer of fluid in contact with the pipe wall has:
Reasoning: Due to viscosity, fluid sticks to the surface (no-slip condition).
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Increasing viscosity of a fluid will:
Reasoning: Higher viscosity means greater resistance.
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A fluid with low viscosity:
Reasoning: Low viscosity means less internal friction.
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The coefficient of viscosity represents:
Reasoning: It quantifies the viscous property of a fluid.
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The SI unit of coefficient of viscosity is:
Reasoning: Dynamic viscosity is measured in $\mathbf{Pa \cdot s}$.
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A fluid having a larger coefficient of viscosity will:
Reasoning: Higher viscosity means stronger resistance to flow.
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Viscous force depends on:
Reasoning: Greater velocity difference increases viscous force.
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When temperature increases, viscosity of liquids generally:
Reasoning: Higher temperature reduces intermolecular attraction in liquids.
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Heating honey makes it flow more easily because:
Reasoning: Liquid viscosity decreases with temperature.
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For gases, increasing temperature generally:
Reasoning: Faster molecules transfer more momentum between layers.
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Lubricating oil becomes less viscous when:
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Real fluids are viscous because:
Reasoning: Molecular interactions produce internal friction, making real fluids viscous.
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Engine oil is used because it:
Reasoning: Oil forms a viscous layer reducing direct contact.
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A parachute falls with terminal velocity because:
Reasoning: Viscous drag balances gravitational force.
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Blood flow in arteries is affected by:
Reasoning: Blood viscosity influences resistance to flow.
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Which fluid has the greatest viscosity?
Reasoning: Honey flows slowly due to high viscosity.
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If the velocity difference between two fluid layers increases, viscous force:
Reasoning: Greater velocity gradient increases viscous force.
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Two fluids have equal density, but fluid A has greater viscosity. Fluid A will:
Reasoning: Greater viscosity produces greater resistance.
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A fluid with zero viscosity is called:
Reasoning: Ideal fluids are assumed to have no viscosity.
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Viscosity converts mechanical energy of fluid mainly into:
Reasoning: Internal friction causes energy dissipation as heat.
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Real fluids cannot be perfectly ideal because:
Reasoning: Molecular forces create viscosity.
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If viscosity did not exist:
Reasoning: Without viscosity, there would be no internal friction.
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The main difference between water and honey flow is:
Reasoning: Higher viscosity makes honey flow slowly.
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