Question

In a nuclear reactor, the fission process is controlled by inserting special rods. What is the purpose of inserting these rods?

1) To absorb excess neutrons
2) To increase the rate of fission
3) To cool down the reactor
4) To generate electricity

Answer 1

Control rods in a nuclear reactor absorb excess neutrons and control the rate of fission.

Step-by-step explanation:

Control rods in a nuclear reactor are inserted to absorb excess neutrons and control the rate of fission. When control rod assemblies are inserted into the fuel element in the reactor core, they absorb a larger fraction of the slow neutrons, which slows down the rate of the fission reaction and decreases the power produced. Conversely, if the control rods are removed, fewer neutrons are absorbed, and the fission rate and energy production increase.