Heat transfer: conduction, convection and radiation Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. Which method of energy transfer needs no particles?
- A. Radiation
- B. Conduction
- C. Convection
- D. Conduction and convection
2. Why does warm air rise?
- A. It becomes denser than the cooler air
- B. Its particles become lighter
- C. It expands and becomes less dense than the cooler air around it
- D. Its particles stop moving
3. Which surface would lose energy by radiation fastest?
- A. Shiny silver
- B. White
- C. Shiny gold
- D. Dull black
4. Why are metals better conductors than plastics?
- A. Metals have more protons
- B. Metals have free electrons that carry energy
- C. Metals have larger particles
- D. Plastics have free electrons that cannot move
5. Which of these reduces energy loss by convection from a hot water tank?
- A. Painting the tank dull black
- B. Removing the insulation
- C. A tight-fitting lid
- D. Increasing the tank's surface area