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Question

Which of the following is used as a fuel in nuclear reactors?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
Uranium

Nuclear Reactor Fuel Explained

Nuclear reactors generate energy through controlled nuclear fission. This process requires a specific type of fuel that can sustain a chain reaction.

Identifying the Correct Fuel Element

The primary fuel used in most nuclear reactors is Uranium, specifically the isotope Uranium-235 (235U).

  • Fissile Nature: Uranium-235 is highly effective because it is fissile, meaning its nucleus can easily split (fission) when struck by a neutron, releasing significant energy and more neutrons.
  • Chain Reaction: These released neutrons can then cause other Uranium-235 nuclei to fission, creating a self-sustaining chain reaction necessary for reactor operation.

Why Other Options Are Unsuitable

The other elements listed are not suitable as primary nuclear reactor fuel:

  • Copper (Cu): A metal primarily used for electrical conductivity and heat transfer; not fissile.
  • Cobalt (Co): A transition metal; while some isotopes are radioactive and used in other applications (like medicine), it's not a primary fission fuel.
  • Iodine (I): A non-metal; some isotopes are radioactive (e.g., 131I used in medicine), but it doesn't undergo fission effectively to sustain a chain reaction in reactors.

Therefore, Uranium is the key element utilized as fuel in nuclear reactors.

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