Nuclear Fission and Fusion Quiz
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5 questions, one answer each
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1. Which of the following correctly describes nuclear fission?
- A. The splitting of a large nucleus into two smaller nuclei with the release of energy and neutrons
- B. The joining of two light nuclei to form a heavier nucleus with the release of energy
- C. The decay of a radioactive nucleus into an alpha particle and a daughter nucleus
- D. The absorption of a neutron by a nucleus causing it to become unstable
2. What is the primary role of the moderator in a nuclear reactor?
- A. To absorb excess neutrons and control the chain reaction
- B. To cool the reactor core and prevent overheating
- C. To slow down fast neutrons so they can cause further fission
- D. To convert thermal energy into electrical energy
3. Why does nuclear fusion require very high temperatures and pressures?
- A. To provide the activation energy needed to overcome the electrostatic repulsion between nuclei
- B. To increase the density of the fuel and make it critical
- C. To slow down the neutrons produced during the fusion reaction
- D. To prevent the release of radiation from escaping the reactor
4. How is a chain reaction controlled in a nuclear reactor?
- A. By using the moderator to absorb excess neutrons and by inserting or withdrawing control rods
- B. By increasing the temperature of the coolant system
- C. By reducing the density of the fuel material
- D. By preventing any moderation of the fast neutrons
5. Explain why nuclear fusion is difficult to achieve on Earth and what research is being conducted to overcome this challenge. Which statement best reflects current fusion research?
- A. Fusion is difficult because it requires extreme temperatures and pressures to overcome electrostatic repulsion; research focuses on developing experimental reactors such as tokamaks that can sustain these conditions
- B. Fusion is difficult because the neutrons produced escape too quickly; research focuses on building thicker reactor walls
- C. Fusion is impossible on Earth because the Sun's gravitational field is needed; research is attempting to recreate this field
- D. Fusion is difficult because fusion reactions produce too much radiation; research focuses on developing better shielding materials