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

Questions

1. 1. Why does a large iceberg at −2 °C contain more heat than a cup of hot tea?

   • Ice particles move faster than tea particles.
   • The iceberg has so many more particles that their total energy is greater.
   • It doesn't; cold objects have no heat.
   • The iceberg has a higher temperature.
   Check

2. 2. Choose the missing word: 100 °C is the ______ at which water boils.

   • density
   • heat
   • temperature
   • energy
   Check

3. 3. Choose the missing word: 25 000 J is the quantity of ______ needed to make cold water warmer.

   • heat
   • density
   • pressure
   • temperature
   Check

4. 4. Choose the missing word: 22 °C is often described as room ______.

   • density
   • heat
   • energy
   • temperature
   Check

5. 5. Sofia has two cups of coffee with the same volume. One is at 55 °C and the other at 30 °C. Which is true?

   • The temperatures are different but the heat is the same.
   • The temperatures and the heat are both the same.
   • The temperatures are different and the amounts of heat are different.
   • The temperatures are the same but the heat is different.
   Check

6. 6. Zara puts 100 cm³ of soup at 60 °C in one bowl and 200 cm³ of soup at 60 °C in another. Which is true?

   • The temperature is the same, but the bigger bowl has more heat.
   • The smaller bowl has more heat.
   • They have the same heat and the same temperature.
   • The bigger bowl has a higher temperature.
   Check

7. 7. What is the unit of temperature?

   • degrees Celsius (°C)
   • grams (g)
   • newtons (N)
   • joules (J)
   Check

8. 8. What is the unit of heat?

   • metres (m)
   • degrees Celsius (°C)
   • kilograms (kg)
   • joules (J)
   Check

9. 9. Match each quantity with its description.

   • heat
   • temperature

   • the average energy of the particles in a substance
   • the total energy of the particles in a substance
   Check

10. 10. How do the particles in a solid move?

    • They vibrate about fixed positions.
    • They don't move at all.
    • They slide past each other.
    • They move freely in all directions.
    Check

11. 11. What happens to the particles in a solid when it is heated?

    • They vibrate more (faster and further).
    • They vibrate less.
    • They stop moving.
    • They get bigger.
    Check

12. 12. A solid cools down. What happens to its particles?

    • They vibrate less.
    • They get smaller.
    • They vibrate more.
    • They leave the solid.
    Check

13. 13. Two solid blocks are at 20 °C. One block has double the mass of the other. Which is true?

    • They have the same temperature, but the heavier block has twice the heat.
    • They have the same heat.
    • The lighter block has more heat because its particles move faster.
    • The heavier block has a higher temperature.
    Check

14. 14. Which piece of equipment measures the temperature of water as it is heated?

    • a joule meter
    • a voltmeter
    • a ruler
    • a thermometer
    Check

15. 15. Which piece of equipment measures how much heat is added to water by an electric heater?

    • a thermometer
    • a joule meter
    • a protractor
    • a ruler
    Check

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

    16. Which of Marcus's results is anomalous?

    • 20 °C at 5000 J
    • 15 °C at 3000 J
    • 10 °C at 0 J
    • 18 °C at 4000 J
    Check

17. 17. What should Marcus do about the anomalous result?

    • Throw away all the results.
    • Leave it in and use it to draw the line.
    • Repeat that measurement and check it.
    • Change it to the number he expected.
    Check

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

    18. Use Marcus's results to estimate the quantity of heat supplied when the temperature of the water was 19 °C.

    • about 19 000 J
    • about 3500 J
    • about 1900 J
    • about 4500 J
    Check

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

    19. Use Marcus's results to estimate the quantity of heat needed to raise the temperature of the water to 30 °C.

    • about 6000 J
    • about 30 000 J
    • about 10 000 J
    • about 15 000 J
    Check