 µ GCSE | Density

10 quick questions - for GCSE and iGCSE

10 minutes maximum! (can you do it in 5?)

Grab a calculator - time for some maths!

Density is a measure of how compact the particles are in a substance.

1. Which of these is the correct formula for density?

• A. density = mass x volume
• B. density = mass ÷ volume
• C. density = volume ÷ mass
• D. density = volume - mass

2. This metal cube of side 2cm has a mass of 32g.

The density is

• A. 2 g/cm3
• B. 4 g/cm3
• C. 8 g/cm3
• D. 16 g/cm3 3. If you heated the cube it would expand a little. This would make ....

• A. ..the mass increase and therefore the density increase.
• B. ..the mass increase and therefore the density decrease.
• C. ..the volume increase and therefore the density decrease.
• D. ..the volume increase and therefore the density increase.

Q 4-6. These questions are about the densities of different substances.

What are the missing values?

 Substance Density (g/cm3) Mass (g) Volume (cm3) 4. Glass ? 54 5.4 0.66 1.5 9 6 5. Lead 11.3 ? 226 2260 0.58 17.7 200 6. Wood 0.8 80 ? 64 100 10 0.01

7. Floating or sinking depends on density.

The density of water is 1 g/cm3.

The density of this block is is 1.1 g/cm3.

This means that if you put this cube in water it will... • A. .. float because it has a density higher than 1 g/cm3.
• B. .. float because it has a density lower than 1 g/cm3.
• C. .. sink because it has a density higher than 1 g/cm3.
• D. .. sink because it has a density lower than 1 g/cm3.

Q8-10.

A green ball has been put into the measuring cylinder shown, and the water level has risen. 8. The water has been...

• A. dispersed.
• B. displaced.
• C. diffracted.
• D. diffused.
9. The density of the ball is:
• A. 0.47 g/cm3
• B. 3.50 g/cm3
• C. 0.91 g/cm3
• D. 1.10 g/cm3
10. If the ball is cut in half and the experiment repeated, the density will   .