Fluids Practice Questions

Which of the following are correct units of density:

Three holes are drilled in a water tower, which is filled with water, at the positions shown. Water will spurt the greatest horizontal distance from hole

• A

• B

• C

• The horizontal distance will be the same for all three holes.

Blood pressure is normally greater in your ...

• ears

• feet

• heart

• same throughout

Answer explanation

Blood pressure is greatest the farther away it is from the heart.

The reason that buoyant force acts upward on a submerged object is that

• it acts in a direction to oppose gravity.

• if it acted downward, nothing would float.

• the weight of fluid displaced reacts with an upward force.

• upward pressure against the bottom is greater than downward pressure against the top of the submerged object.

A completely submerged object always displaces its own

• volume

• weight

• density

• all of these

What is the buoyant force acting on a 10-ton ship floating in the ocean?

• less than 10 tons

• 10 tons

• more than 10 tons

• depends on density of sea water

An ideal liquid is moving at a rate of 1.8 m/s through a horizontal 1.0 diameter pipe.  What happens to the pressure of the liquid when the diameter is increased to 1.5 inches?

• The pressure increases

• The pressure decreases

• The pressure remains the same

• Not enough information

Answer explanation

The larger pipe decreases the speed and increases the pressure on the pipe.

An ideal liquid is moving at a rate of 1.8 m/s through a horizontal 1.0 diameter pipe.  What happens to the velocity of the liquid when the diameter is increased to 1.5 inches?

• The velocity increases

• The velocity decreases

• The velocity remains the same

• Not enough information

A dam is thicker at the bottom than at the top partly because

• water is denser at deeper levels.

• water pressure is greater with increasing depth.

• surface tension exists only on the surface of liquids.

• it looks better.

The pressure in a liquid depends on liquid

• density

• depth

• both of these

• neither of these