Science 9 · Unit 3: Forces and energy · Cambridge Lower Secondary Science Stage 9

Questions

1. 1. A 1 kg bag of feathers and a 1 kg bar of iron are compared. Which is true?

   • The iron has more mass.
   • They have the same mass, but the feathers take up much more volume, so they are less dense.
   • The feathers are denser because they take up more space.
   • They have the same density.
   Check

2. 2. A stone has an odd shape. How could you measure its volume?

   • Lower it into a measuring cylinder of water and see how much the water level rises.
   • Weigh it on a balance.
   • Measure its longest side and cube it.
   • Wrap it in string and measure the string.
   Check

3. 3. Why is a solid usually denser than the same substance as a gas?

   • A solid has more particles in each one.
   • The particles in a solid are packed much more closely together.
   • The particles in a solid are heavier.
   • The particles in a gas are bigger.
   Check

4. 4. Two blocks are made of the same metal. Block X is twice the volume of block Y. What can you say about their densities?

   • X is twice as dense as Y.
   • X is half as dense as Y.
   • They have the same density.
   • Y is twice as dense as X.
   Check

5. 5. Crude oil spills out of a ship into the sea. Crude oil is less dense than water. What happens?

   • The oil and water mix completely.
   • The oil floats on the water.
   • The oil sinks to the bottom.
   • The water floats on the oil.
   Check

6. 6. Which state of matter usually has the lowest density?

   • solid
   • They all have the same density.
   • liquid
   • gas
   Check

7. 7. Marcus has four blocks, each made from a different type of wood. All four blocks have the same volume. Their masses are: A 50 g, B 76 g, C 32 g, D 68 g. Which block has the greatest density?

   • D
   • B
   • A
   • C
   Check

8. 8. Zara has four pieces of metal, each made from a different type of metal. All four pieces have the same mass. Their volumes are: P 22 cm³, Q 35 cm³, R 19 cm³, S 27 cm³. Which piece has the greatest density?

   • R
   • S
   • Q
   • P
   Check

9. 9. A solid block is put in water. For the block to float, how must its density compare with water's?

   • It must be less than the density of water.
   • Density does not affect floating.
   • It must be more than the density of water.
   • It must be exactly the same as water.
   Check

10. 10. Which statement describes density?

    • the mass of a certain volume of a substance
    • the volume of a certain mass of a substance
    • the weight of a substance
    • the volume that a substance takes up
    Check

11. 11. Which is the equation for density?

    • density = mass × volume
    • density = mass − volume
    • density = mass ÷ volume
    • density = volume ÷ mass
    Check

12. 12. A 10 g mass of water has a volume of 10 cm³. What is its density?

    • 10 g/cm³
    • 0 g/cm³
    • 100 g/cm³
    • 1.0 g/cm³
    Check

13. 13. A 170 g mass of brass has a volume of 20 cm³. What is its density?

    • 150 g/cm³
    • 3400 g/cm³
    • 0.12 g/cm³
    • 8.5 g/cm³
    Check

14. 14. A 56 g mass of propane has a volume of 100 cm³. What is its density?

    • 5600 g/cm³
    • 44 g/cm³
    • 0.56 g/cm³
    • 1.79 g/cm³
    Check

15. 15. A solid cube is made from copper. The lengths of the sides of the cube are 2.0 cm. What is the volume of the cube?

    • 4.0 cm³
    • 12.0 cm³
    • 6.0 cm³
    • 8.0 cm³
    Check

16. 16. A copper cube with sides of 2.0 cm has a mass of 71.2 g. What is the density of the copper?

    • 35.6 g/cm³
    • 8.9 g/cm³
    • 17.8 g/cm³
    • 0.11 g/cm³
    Check

17. 📖 This question is about a text that students read in the app.

    17. Name a type of plastic from the table that will float in both engine oil and water.

    • polyethylene
    • polypropylene
    • polyvinyl chloride
    • cellulose acetate
    Check

18. 📖 This question is about a text that students read in the app.

    18. Name a type of plastic from the table that will sink in engine oil but float in water.

    • cellulose acetate
    • polyvinyl chloride
    • polyethylene
    • polypropylene
    Check

19. 📖 This question is about a text that students read in the app.

    19. Which plastics from the table will sink in both engine oil and water?

    • polypropylene only
    • polyethylene and polypropylene
    • cellulose acetate and polyvinyl chloride
    • none of them
    Check

20. 20. Marcus has a model boat with a volume of 250 cm³. The density of water is 1.0 g/cm³. What is the maximum mass of the boat that will float in water?

    • 125 g
    • 250 g
    • 25 g
    • 2500 g
    Check