Energy Stores & Transfers Quiz
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5 questions, one answer each
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1. Which principle states that energy cannot be created or destroyed?
- A. Conservation of momentum
- B. Conservation of energy
- C. Newton's third law
- D. Hooke's law
2. A device has an efficiency of 60% and a total energy input of 300 J. How much useful energy output does it produce?
- A. 60 J
- B. 120 J
- C. 180 J
- D. 240 J
3. Which thermal transfer process can happen through a vacuum?
- A. Conduction
- B. Convection
- C. Radiation
- D. None of these
4. Why does convection not occur in solids?
- A. Solids have no thermal energy
- B. Particles in a solid cannot flow to circulate energy
- C. Solids reflect all radiation
- D. Solids conduct too quickly for convection
5. What does the width of an arrow represent on a Sankey diagram?
- A. Time taken for the transfer
- B. The temperature of the system
- C. The amount of energy transferred
- D. The efficiency of the whole system