Question
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First nuclear reactor was built in
A)Russia
B)U.S.A
C)U.K
D)France

Answer
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Hint: A nuclear reactor is a system used for initiating and regulating a self-sustained nuclear chain reaction, formerly known as an atomic mound. In nuclear power plants for electricity generation and in nuclear marine propulsion, nuclear reactors are used.

Complete answer:
The fuel, moderator, control rods, coolant, pressure vessel or pressure tubes, steam generator and containment are the components of a nuclear reactor.
The release of energy from splitting the atoms of certain elements is produced and controlled by a nuclear reactor. The energy released is used as heat in a nuclear power reactor to make steam to generate electricity. For most types of reactor, the principles for using nuclear power to generate electricity are the same.
The energy emitted from the continuous fission of the fuel atoms is harnessed in either gas or water as heat and used for the production of steam. The steam is used to drive the power generating turbines.

Chicago Pile 1 was the first nuclear reactor in the world and was designed by Nobel Prize winner Enrico Fermi in 1942. Underneath the Stagg Field football stadium of the University of Chicago, the reactor was built. Enrico Fermi and 48 of his colleagues succeeded in achieving the world's first man-made controlled nuclear chain reaction in this reactor on Dec. 2, 1942, thus creating mankind's capacity to control the release of nuclear energy.He later founded Argonne National Laboratory together with other scientists from that group.

Hence, the correct answer is option (A)

Note: The release of energy from splitting the atoms of certain elements is generated and regulated by a nuclear reactor. The energy released is used as heat in a nuclear power reactor to make steam to generate electricity. (The main aim of a research reactor is to use the real neutrons that are generated in the core.