Fluids Unit Review

In what direction(s) does air exert a pressure?

• everywhere

• nowhere

• there is no pressure

• downward

Any substance that can flow and change shape is called a:

• solid

• liquid

• gas

• fluid

Which box has a higher density?

• Box A

• Box B

• Cannot be determined

• They are the same

If an object sinks in a fluid, then...

• the density of the fluid is MORE than the density of the object

• the density of the fluid is LESS than the density of the object

• the density of the fluid is EQUAL than the density of the object

• Density has nothing to do with whether an object sinks or floats.

Water pressure increases as depth increases.

• True

• False

The term fluid generally applies to:

• solids and liquids

• solids and plasma

• gasses and water

• liquids and gasses

Which of the following statements about particles is NOT correct?

• Gases expand to fill their container because they have very weak attractive forces.

• Solids have a fixed shape because they have strong forces between particles

• Liquids are easy to compress because their particles are closer together than gases.

Why do substances expand when they are heated?

• the particles get bigger

• the particles vibrate more and take up more space

• the particles vibrate more and get closer together

• the particles stick together

How does air pressure change as you go from the top of a mountain to sea level?

• pressure increases

• pressure decreases

• pressure stays the same

• it depends on the weather

Why does a hot air balloon float in the air?

• Air is less dense than water

• The density of hot air is less than the density of cold air

• air is denser on cold days

• the overall density of the balloon and its basket is less than the density of the air around it