Nuclear fission and fusion Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. For a chain reaction to be sustained, how many neutrons from each fission must, on average, cause another fission?
- A. None
- B. Less than one
- C. At least one
- D. Exactly three
2. A fusion reaction has a total mass decrease of 0.0150 u. What energy is released?
- A. 14.0 MeV
- B. 1.40 MeV
- C. 140 MeV
- D. 0.0150 MeV
3. Which property is needed for the material of control rods?
- A. Slows neutrons by elastic collisions
- B. High specific heat capacity
- C. Very low neutron absorption
- D. Strong absorption of neutrons
4. What is the function of the moderator?
- A. To absorb neutrons and control the rate of fission
- B. To slow fast neutrons by elastic collisions
- C. To carry thermal energy to the boiler
- D. To act as extra fuel
5. Why can a small piece of uranium-235 not sustain a chain reaction?
- A. It releases no neutrons
- B. Its neutrons are too slow
- C. Too many neutrons escape through the surface
- D. It is not hot enough to fission