# Heat transfer

> Grade 8: conduction, convection, radiation, insulators reduce heat loss, temperature vs heat.

Source: https://olyclass.com/library/science-g8-heat-transfer-en/

- Subject: Science
- Level: Grade 8
- Quiz: 16
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## Questions

1. How does heat travel through a solid metal spoon placed in hot soup? (Conduction / Convection / Evaporation / Radiation)
   Answer: Conduction
2. Which material is the best conductor of heat? (Copper / Plastic / Rubber / Wood)
   Answer: Copper
3. In conduction, particles pass on vibrations to their neighbours.
   Answer: True
4. Why does heat conduct better in metals than in gases? (Particles are bigger / Particles are closer together / Particles are colder / Particles do not move)
   Answer: Particles are closer together
5. Heat transfer by the movement of fluids is called what? (Conduction / Convection / Insulation / Radiation)
   Answer: Convection
6. When air is heated, what happens to its density? (It becomes zero / It decreases / It increases / It stays the same)
   Answer: It decreases
7. Warm air rises above a radiator. What is this movement of air called?
   Answer: A convection current
8. How does heat from the Sun reach Earth? (Conduction / Convection / Evaporation / Radiation)
   Answer: Radiation
9. Radiation needs particles of matter to carry heat from place to place.
   Answer: False
10. Which surface is best at absorbing heat radiation? (Dull black / Dull white / Shiny silver / Shiny white)
   Answer: Dull black
11. Why do woolly jumpers keep you warm? (They block cold particles / They conduct heat well / They create heat / They trap air, which insulates)
   Answer: They trap air, which insulates
12. Name the type of material that is poor at conducting heat.
   Answer: An insulator
13. Why is a double-glazed window with a gap between the panes a good insulator? (Air conducts heat very well / Gaps let in more heat / Glass makes heat / Trapped air or gas conducts poorly)
   Answer: Trapped air or gas conducts poorly
14. What is temperature a measure of? (How fast heat is lost / How hot or cold something is / The mass of a substance / The total heat energy stored)
   Answer: How hot or cold something is
15. A bathtub of warm water contains more heat energy than a cup of boiling water.
   Answer: True
16. What unit is usually used to measure heat energy in science?
   Answer: Joule