Grade 8 Science - Density and Buoyancy

The formula for density is:

• density = mass/ acceleration

• density = volume/ mass

• density = mass/ volume

• none of the above

When a clay ball is placed in the water it ________, or pushes aside the water.

• displaces

• weighs

• sinks

• prioritizes

Looking at the image, can oak float in water?

• Yes

• No

What is the volume of Object X?

• 10.0 cm³
• 15.0 cm³
• 20.0 cm³
• 25.0 cm³

An empty beaker has a mass of 60 grams.  When mercury is added to the graduated cylinder, it has a mass of 200 grams. What is the mass of the mercury?

• 140 grams
• 200 grams
• 140 mL
• 260 g

The density of this material is 2 g/cm³.

The volume is 24 cm³ Find the total mass.

• 12 grams

• 48 grams

• 12 g/cm³

• 48 g/cm³

Find the volume of this piece of brass.  

• 50 g
• 10 cm
• 6 cm³
• 12 cm³

What happens when you heat a gas?

• It gains mass.
• It loses mass.
• It increases in volume.
• It decreases in volume.

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

Hot air is less dense than cold air

• true
• false