Fluid Mechanics Quiz

Evelyn is trying to fill two containers: one with water and one with air. She notices that it's much harder to squeeze the container with water to make it smaller, but the container with air can be compressed easily. What is a key difference between liquids and gases that explains this?

• Both are incompressible

• Liquids have no fixed volume

• Gases occupy a fixed volume

• Liquids are difficult to compress

Noah is observing a balloon filled with air. He wonders why the gas molecules inside the balloon are so widely spaced compared to liquids and solids. What is the main reason for this?

• High cohesive forces.

• Low cohesive forces.

• High density.

• Low temperature.

Daniel is studying fluid mechanics and is curious about its application areas. Which of the following is NOT mentioned as an application area of fluid mechanics?

• Breathing

• Blood flow

• Cooking

• Swimming

Liam accidentally spills some honey on a table and then tries to push it with a spoon. How does the honey respond to the applied shear stress?

• By resisting

• By deforming continuously

• By solidifying

• By evaporating

Olivia is working in a laboratory and needs to determine the kinematic viscosity of a liquid sample. She knows that kinematic viscosity is the

• ratio of absolute viscosity to the density of the liquid

• ratio of specific gravity of the liquid to the absolute viscosity

• product of absolute viscosity and density of the liquid

• product of absolute viscosity and mass of the liquid

Charlotte is conducting an experiment with a thin glass tube and some water. She notices that the water rises inside the tube when she places it into the container. This will happen if...

• the adhesion force between molecules of fluid and tube is less than the cohesion between liquid molecules

• the adhesion force between molecules of fluid and tube is more than the cohesion between liquid molecules

• the adhesion force between molecules of fluid and tube is equal to the cohesion between liquid molecules

• None of the above

Fluids for which the shearing stress is not linearly realted to the rate of the shearing strain are designated as what?

• Viscous fluids

• Newtonian fluid

• Non-Newtonian fluid

• Ideal fluid

Harper is conducting an experiment in her science class. She places different liquids into a glass tube to observe how they interact with the surface. Which of the following is a good example of a non-wetting liquid when it is in contact with a glass tube?

• Water

• Saltwater

• Mercury

Which of the following best describes a Bingham plastic fluid?

• A fluid that has a constant viscosity regardless of the applied stress.

• A fluid that flows only after a certain yield stress is exceeded and then behaves like a Newtonian fluid.

• A fluid whose viscosity decreases with increasing shear rate.

• A fluid that behaves like a solid until a critical temperature is reached.

Benjamin is studying the flow of water through a pipe in his engineering class. He wants to model the water as an ideal fluid to simplify his calculations. A fluid is said to be ideal, if it is

• incompressible

• viscous and incompressible

• inviscous and compressible

• inviscous and incompressible