Match List - I with List - II.

List - I		List - II
(Components of Reactor)		(Function)
(A)	Uranium	(I)	Reaction rate can be controlled by it
(B)	Moderator	(II)	Slows down the fast moving neutrons
(C)	Control rod	(III)	Used for fission reaction
(D)	Coolent	(IV)	Transfers heat from core to turbine

Choose the correct answer from the options given below :

Concept:

Uranium:

• Uranium is a radioactive element commonly used as fuel in nuclear reactors. It can undergo nuclear fission, releasing a large amount of energy.
• The rate of the fission reaction can be controlled by adjusting the concentration of Uranium-235, a fissile isotope of uranium, in the fuel rods.
• It is used for fission reactions.

Moderator:

• In a nuclear reactor, the fission reaction produces fast-moving neutrons that need to be slowed down in order to interact with the fuel and sustain the reaction.
• The moderator is a material, usually water or graphite, that is used to slow down the neutrons to a speed at which they can interact with the fuel and produce more neutrons.
• It Slows down the fast-moving neutrons

Control rod:

• Control rods are devices made of neutron-absorbing materials such as boron or cadmium that can be inserted or removed from the reactor core to control the rate of the fission reaction.
• By absorbing neutrons, the control rods reduce the number of neutrons available to interact with the fuel, slowing down or stopping the reaction. 
• The reaction rate can be controlled by it.

Coolant:

• The coolant is a fluid, typically water or gas, that circulates through the reactor core to transfer heat from the fuel rods to a steam turbine.
• The heat generated by the fission reaction is used to produce steam, which drives the turbine and generates electricity.
• The coolant also helps to regulate the temperature of the core and prevent it from overheating.
• It transfers heat from the core to turbine.

​So, the answer would be (A) - (III), (B) - (II), (C) - (I), (D) - (IV)

The correct answer is option (3).