Nuclear Reactions: Fission and Fusion

What process is responsible for the sun's energy production?

• Chemical combustion

• Geothermal energy

• Nuclear fusion

• Nuclear fission

What is a chain reaction in the context of nuclear fission?

• A reaction that only occurs in stars

• A reaction that stops after one event

• A self-sustaining reaction that produces further reactions

• A reaction that requires constant external input

What is the critical mass in nuclear fission?

• The maximum mass of an isotope for a reaction

• The minimum mass of an isotope required to sustain a chain reaction

• The mass at which a reaction becomes uncontrollable

• The mass needed to stop a reaction

What is the primary challenge in achieving nuclear fusion on Earth?

• Achieving the necessary temperature and pressure

• Controlling the speed of neutrons

• High cost of uranium

• Lack of hydrogen isotopes

Which element is commonly formed as a result of nuclear fusion in stars?

• Helium

• Carbon

• Magnesium

• Oxygen

What is a significant advantage of nuclear fusion over fission?

• It uses simpler starting materials

• It is easier to control

• It produces more radioactive waste

• It requires less energy to start

What is a major drawback of nuclear fission reactors?

• They are easy to control

• They generate radioactive waste

• They require no starting material

• They produce helium as a byproduct

What is the main reason fusion is not yet a practical energy source?

• It uses rare materials

• It is difficult to sustain the reaction

• It is too easy to control

• It produces too much energy

Which reaction type is currently used in nuclear power plants?

• Fusion

• Fission

• Combustion

• Photosynthesis

What is a common byproduct of nuclear fusion?

• Plutonium

• Carbon dioxide

• Helium

• Uranium