Shear Stress Quiz: Test Your Knowledge Of Fluid Forces

11th Grade

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By Thames

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| Questions: 20 | Updated: Mar 17, 2026

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1. Shear stress in a fluid is a force:

Perpendicular to a surface per unit area

Parallel to a surface per unit area

Caused only by gravity

That exists only in solids

Concept: Shear stress meaning. Shear stress acts tangentially and tends to make layers slide. In fluids, it appears when adjacent layers move at different speeds.

Explanation

Concept: Shear stress meaning. Shear stress acts tangentially and tends to make layers slide. In fluids, it appears when adjacent layers move at different speeds.

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About This Quiz

Shear Stress Quiz: Test Your Knowledge Of Fluid Forces - Quiz

This assessment explores shear stress, a key concept in fluid mechanics. It evaluates your understanding of fluid forces, their applications, and the principles governing shear stress. Engaging with this material is essential for students and professionals in engineering and physics, enhancing your grasp of critical fluid dynamics concepts.

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2. In a Newtonian fluid, shear stress is proportional to the velocity gradient.

True

False

Concept: Newton’s law of viscosity. Newton’s law links shear stress to how quickly velocity changes between layers. This is why larger velocity gradients produce larger shear stresses.

Explanation

Concept: Newton’s law of viscosity. Newton’s law links shear stress to how quickly velocity changes between layers. This is why larger velocity gradients produce larger shear stresses.

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3. The velocity gradient (dydu) describes:

Temperature change with height

Pressure change with time

How velocity changes between adjacent layers

How density changes with speed

Concept: Velocity gradient. A velocity gradient measures how rapidly speed changes across the flow. It captures how strongly layers are trying to slide past each other.

Explanation

Concept: Velocity gradient. A velocity gradient measures how rapidly speed changes across the flow. It captures how strongly layers are trying to slide past each other.

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4. The symbol commonly used for dynamic viscosity is ______.

Concept: Dynamic viscosity symbol. Dynamic viscosity (μ) quantifies resistance to shearing deformation. It connects shear stress to the velocity gradient for Newtonian fluids.

Explanation

Concept: Dynamic viscosity symbol. Dynamic viscosity (μ) quantifies resistance to shearing deformation. It connects shear stress to the velocity gradient for Newtonian fluids.

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5. If μ increases while dydu stays the same, shear stress τ will:

Decrease

Increase

Stay the same

Become zero

Concept: Proportionality. For Newtonian fluids, τ=μdydu. Increasing μ increases the shear stress required for the same gradient.

Explanation

Concept: Proportionality. For Newtonian fluids, τ=μdydu. Increasing μ increases the shear stress required for the same gradient.

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6. A larger velocity gradient generally means greater internal friction effects.

True

False

Concept: Shear and friction link. A bigger gradient means neighbouring layers differ more in speed. That increases the viscous “dragging” between layers.

Explanation

Concept: Shear and friction link. A bigger gradient means neighbouring layers differ more in speed. That increases the viscous “dragging” between layers.

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7. The SI unit of dynamic viscosity is:

Pa·s

M/s

Concept: Units of viscosity. Dynamic viscosity has units of Pa·s, consistent with shear stress (Pa) divided by velocity gradient (1/s). The units reflect resistance to shear over time.

Explanation

Concept: Units of viscosity. Dynamic viscosity has units of Pa·s, consistent with shear stress (Pa) divided by velocity gradient (1/s). The units reflect resistance to shear over time.

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8. Shear stress is commonly written using the symbol ______.

Concept: Shear stress notation. τ represents tangential force per area. It’s the key stress associated with viscous shear in flowing fluids.

Explanation

Concept: Shear stress notation. τ represents tangential force per area. It’s the key stress associated with viscous shear in flowing fluids.

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9. In fluid between moving plates (Couette flow), viscosity mainly affects:

The colour of the fluid

How much shear stress is needed to maintain a given velocity gradient

Whether gravity exists

Whether pressure is defined

Concept: Couette flow role of viscosity. Maintaining a velocity difference between plates requires shear stress. Higher viscosity means more stress (more force per area) for the same gradient.

Explanation

Concept: Couette flow role of viscosity. Maintaining a velocity difference between plates requires shear stress. Higher viscosity means more stress (more force per area) for the same gradient.

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10. If both plates move together at the same speed, the velocity gradient between them is zero.

True

False

Concept: Zero relative motion. With no relative motion, all layers share the same speed. That makes dydu=0, so Newtonian shear stress becomes zero.

Explanation

Concept: Zero relative motion. With no relative motion, all layers share the same speed. That makes dydu=0, so Newtonian shear stress becomes zero.

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11. A fluid’s resistance to shear is most directly quantified by:

Density

Dynamic viscosity

Volume

Temperature

Concept: Correct property. Dynamic viscosity directly measures resistance to shearing flow. Density and volume do not measure internal friction.

Explanation

Concept: Correct property. Dynamic viscosity directly measures resistance to shearing flow. Density and volume do not measure internal friction.

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12. τ=μdydu is known as Newton’s law of ______.

Concept: Naming the law. This equation defines Newtonian behaviour in shear flow. It states shear stress is proportional to velocity gradient.

Explanation

Concept: Naming the law. This equation defines Newtonian behaviour in shear flow. It states shear stress is proportional to velocity gradient.

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13. A very low-viscosity fluid can still have large shear stress if the velocity gradient is extremely large.

True

False

Concept: Two-factor dependence. Shear stress depends on both μ and dydu. Even small μ can yield large τ if the gradient is huge.

Explanation

Concept: Two-factor dependence. Shear stress depends on both μ and dydu. Even small μ can yield large τ if the gradient is huge.

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14. Which situation likely creates a large velocity gradient?

Fluid at rest everywhere

Adjacent layers moving at very different speeds over a tiny distance

Concept: Gradient intuition. Large gradients come from big changes over small distances. Strong relative sliding between neighbouring layers creates high shear.

Explanation

Concept: Gradient intuition. Large gradients come from big changes over small distances. Strong relative sliding between neighbouring layers creates high shear.

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15. If the velocity gradient doubles in a Newtonian fluid, shear stress:

Halves

Doubles

Stays the same

Becomes unpredictable

Concept: Linear scaling. In Newtonian fluids, τ scales linearly with dydu. Doubling the gradient doubles the stress.

Explanation

Concept: Linear scaling. In Newtonian fluids, τ scales linearly with dydu. Doubling the gradient doubles the stress.

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16. Viscosity measures a fluid’s resistance to deformation by shear.

Concept: Viscosity definition (mechanics). Viscosity describes how strongly a fluid resists shearing motion. It is not the same as compressibility or density.

Explanation

Concept: Viscosity definition (mechanics). Viscosity describes how strongly a fluid resists shearing motion. It is not the same as compressibility or density.

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17. Kinematic viscosity is typically written as:

Concept: Kinematic viscosity symbol. ν is used for kinematic viscosity. It relates dynamic viscosity to density and is useful in flow-regime analysis.

Explanation

Concept: Kinematic viscosity symbol. ν is used for kinematic viscosity. It relates dynamic viscosity to density and is useful in flow-regime analysis.

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18. Kinematic viscosity has SI units of ______.

M/s

False

Concept: Kinematic viscosity units. ν behaves like a momentum diffusion coefficient. That’s why its units are area per time.

Explanation

Concept: Kinematic viscosity units. ν behaves like a momentum diffusion coefficient. That’s why its units are area per time.

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19. If two fluids have the same μ but different densities, the one with higher density has:

Higher ν

Lower ν

The same ν

Zero ν

Concept: ν=μ/ρ. For fixed μ, increasing ρ reduces ν. This changes Reynolds number and how easily momentum spreads.

Explanation

Concept: ν=μ/ρ. For fixed μ, increasing ρ reduces ν. This changes Reynolds number and how easily momentum spreads.

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20. Dynamic viscosity and kinematic viscosity always have the same units.

Concept: Different quantities. Dynamic viscosity (μ) and kinematic viscosity (ν) are related but not identical. They describe different aspects of flow resistance and have different units.

Explanation

Concept: Different quantities. Dynamic viscosity (μ) and kinematic viscosity (ν) are related but not identical. They describe different aspects of flow resistance and have different units.

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