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The minimum mass of fissile material needed to sustain a chain reaction is known as the
Amass defect
Bcritical mass
Catomic mass
Dmolar mass
Answer & Solution
Correct answer: B. critical mass
1. To sustain a chain reaction, neutron production must exceed neutron loss.
2. This happens only above a certain minimum mass of fissile material.
3. That minimum is called the critical mass.
4. Mass defect is the mass lost as energy, a different idea.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 6 Nuclear Physics "Nuclear Physics", p.86_
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