Fluids Mid Unit Quiz

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

The term fluids generally applies to:

• solid and liquid

• liquid and gas

• solid and plasma

• water only

These statements are about the particle model of matter. Which one is not correct?

• Liquids are hard to compress because their particles are very close together

• Gases expand to fill their container because there are only weak forces between the particles

• Liquids can flow because there are only very weak forces between the particles

• Solids have a fixed shape because there are very strong forces between the particles

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

Buoyant force acts in the ________________ of gravity, making things feel lighter

• same direction

• opposite direction

which of the following statements is true?

• oil floats on water because oil is less dense than water
• oil does not float on water because water is more dense
• water floats on oil because water is less dense

Density formula

• Density= mass*volume

• Density=volume/mass

• Density= mass + volume

• Density= mass/volume

An object has a mass of 15 grams and a volume of 12 cm3. What is the density of this object?

• 2.63 g/cm3

• 1.25 g/cm3

• 0.865 g/cm3

• 0.579 g/cm3

A rubber duck has a mass of 4.3 grams and a volume of 11 mL. What is the density of the rubber duck?

• 2.56 g/mL

• 0.87 g/mL

• 0.391 g/mL

• 1.05 g/mL

What is the multiplication factor if the area of the master piston is 25 cm2 and the area of the slave piston is 175 cm2? (Number only)

(a)