Fluids Test

What is a characteristic difference between a solid and a liquid?

• A solid has a definite shape and volume, while a liquid has a definite volume but takes the shape of its container.

• A solid and a liquid both have a definite shape and volume.

• A liquid has both a definite shape and volume, while a solid only has a definite shape.

• A solid has a definite volume, whereas a liquid has neither definite shape nor volume.

Which of the following statements about floating objects is correct?

• The object’s density is greater than the density of the fluid on which it floats.

• The object’s density is equal to the density of the fluid on which it floats.

• The displaced volume of fluid is greater than the volume of the object.

• The buoyant force equals the object’s weight.

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 slightly opened faucet

• Smoke twisting as it moves upward from a fire

An ideal fluid flows through a pipe made of two sections with diameters of 1 cm and 3 cm, respectively. By what factor would you have to multiply the velocity of the liquid flowing through the 1 cm section to obtain the velocity of liquid flowing through the 3 cm section?

• 9

• 6

• 1/3

• 1/9

Why does the lift on an airplane wing increase as the speed of the airplane increases?

• The pressure behind the wing becomes less than the pressure in front of the wing.

• The pressure behind the wing becomes greater than the pressure in front of the wing.

• The pressure above the wing becomes less than the pressure below the wing.

• The pressure above the wing becomes greater than the pressure below the wing.

What happens when a person blows between two paper cups that are hung by strings 10 cm apart?

• The cups move toward each other.

• The cups move away from each other.

• The cups do not move.

• The cups move upward.

Where is the pressure greater, one meter beneath the surface of Lake Michigan or one meter beneath the surface of a swimming pond?

• In Lake Michigan

• The pressure is approximately the same in both places

• In the pond

Archimedes' principle says that an object is buoyed up by a force that is equal to the ____.

• weight of the fluid displaced

• mass of the fluid displaced

• volume of the fluid displaced

• mass of the object

Where is the buoyant force on a submerged rock greater, near the surface of the fluid or 10 m below the surface?

• Near the surface

• 10 m below the surface

• Neither place—the buoyant force is independent of depth

Lobsters live on the bottom of the ocean. The density of a lobster is ____.

• equal to the density of seawater

• greater than the density of seawater

• less than the density of seawater