Quiz 5: Fluid Mechanics

All fluids are:

• gases

• liquids

• gases or liquids

• non-metallic

Which of the following statements is NOT correct?

• A fluid flows
• a fluid has a definite shape
• molecules of a fluid are free to move past each other
• a fluid changes it shape easily

Several cans of different sizes and shapes are all filled with the same liquid to the same depth. Then,

• The pressure on the bottom of each can is the same

• The weight of the liquid on the bottom of each can is the same

• The least pressure is at the bottom of the can with the largest bottom area

• the force of the liquid on the bottom of each can is the same

The vessels shown above all contain water to the same height. Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest.

• 1,2,3,4

• 3,4,2,1

• 4,3,2,1

• 2,3,4,1

• All pressures are the same

Archimedes' Principle states that... 

• The buoyant force acting on an object equals the volume of the fluid displaced by the object. 
• The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object.
• The buoyant force acting on an object will always be equal. 

According to Archimedes' principle, if a body is immersed partially or fully in a fluid then the buoyancy force is _______ the weight of fluid displaced by the body.

• equal to

• less than

• more than

• unpredictable

Which of the following is NOT an example of laminar flow?

• a river moving slowly in a straight line
• smoke rising upward in a smooth column through air
• water flowing evenly from a slight opened faucet
• smoke twisting as it moves upward from a fire

Due to Bernoulli's principle, the pressure is ............... above an airplane's wing than below it.

• Lower

• Higher

States that as the velocity of a fluid increases, the pressure decreases.  This causes planes to fly . 

• Archimedes' Principle
• Bernoulli's Principle
• Pascal's Principle

Bernoulli's principle states that as the velocity of a fluid ______, the pressure exerted by the fluid ______

• increases; increases

• decreases; decreases

• increases; decreases

• decreases; increases