Fluids - Year 8

What are the states of matter?

• solid, liquid, and juice
• solid and liquid
• solid and gas
• solid, liquid, and gas

Which box has a higher density?  

• Box A
• Box B
• cannot be determined
• they are the same

If an object sinks in a fluid, _____.

• the density of the fluid is greater 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 to the density of the object
• density has nothing to do with whether an object sinks or floats, only which state of matter the object is

Water pressure increases as depth increases. 

• True
• False

The term fluids generally applies to:

• solid and liquid

• liquid and gas

• solid and plasma

• water only

Which statements below is INCORRECT about liquids and gases?

• Liquids possess greater kinetic energy than gases.

• Gases have weak molecular force of attraction while liquids have a moderate force of attraction.

• Liquids have a definite size where gases can expand to fill any closed container.

• Gases are easily compressed where liquids are not.

Why do solids 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

Why do solids 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

Density is

• the weight of a fixed mass of something

• the volume of a fixed weight of something

• the weight of a fixed volume of something

• the mass of a fixed volume of something

What is the secret of how a ship floats?

• its size 
• its hollow shape 
• the amount of cargo it carries
• number of passengers on board