The size of the reactor is said to be critical when

A. Chain reaction can be initiated

B. It becomes uncontrollable

C. It explodes

D. It produces no power

Answer: Option A

Solution(By Examveda Team)

When the atom-splitting reactor of a nuclear power plant is operating normally, it is said to be “critical” or in a state of “criticality.”
Criticality means that a reactor is controlling a sustained fission chain reaction, where each fission event releases a sufficient number of neutrons to maintain an ongoing series of reactions. This is the normal state of nuclear power generation.