Q. Who invented Nuclear Reactor?
Answer: Enrico Fermi
Notes: The first nuclear reactor was developed by Enrico Fermi and his team at the University of Chicago in 1942. It was called the Chicago Pile-1 and was a crude, experimental reactor built using natural uranium and heavy water as a moderator. The purpose of the experiment was to see if it was possible to sustain a nuclear chain reaction, which was accomplished on December 2, 1942.