Energy Transfers & Particle Motion Quiz
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5 questions, one answer each
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1. What is the main mechanism of energy transfer by conduction?
- A. Particles moving from a hot region to a cold region
- B. Particle collisions passing on kinetic energy without particles moving location
- C. Electromagnetic waves travelling through a vacuum
- D. Particles becoming less dense and rising
2. Why are metals particularly good conductors of energy?
- A. They have no free particles at all
- B. They contain free electrons that carry energy quickly through the structure
- C. They are always at a higher temperature than insulators
- D. Their particles do not vibrate
3. Which best explains why convection occurs in a fluid that is heated from below?
- A. The heated fluid becomes denser and sinks
- B. The heated fluid becomes less dense and rises above cooler, denser fluid
- C. The fluid particles stop moving once heated
- D. Heat cannot travel through fluids at all
4. Which of these increases the rate of evaporation of a liquid?
- A. Decreasing the surface area
- B. Increasing air movement over the surface
- C. Increasing the humidity of the surrounding air
- D. Cooling the liquid down
5. A student wants to design cooling fins for a processor to transfer energy away as fast as possible. Which design choice would be most effective and why?
- A. Make the fins smooth and shiny with minimal surface area to reduce weight
- B. Maximise the surface area of the fins, since a larger surface area to volume ratio increases the rate of energy transfer
- C. Reduce the temperature difference between the fins and the surroundings
- D. Use an insulating material for the fins instead of a metal