Question

6. Excess neutrons are absorbed by .......
controlled nuclear fission.
(A) Boron and calcium rods
(B) Boron and cadmium rods
(C)
Calcium and cadmium rods
(D) None of these​

Answer 1

Answer:  

Excess neutrons are absorbed by boron and cadmium controlled nuclear fission.  

Explanation:  

The part of the rector which is involved in controlling the rate of the reaction occurring in the nuclear reactor is called as control rods. Neutrons are considered as the driving factors of nuclear reaction. Excess of its production must be checked as it may interfere with the reaction. Thus ‘Excess neutrons’ are absorbed by boron and cadmium controlled nuclear fission.

Answer 2

Answer:

The correct answer is (B) "Boron and cadmium rods".

Explanation:

"Excess neutrons" are absorbed by "Boron and cadmium rods" controlled nuclear fission. These rods are known as control rods. Control rods are generally used in "nuclear reactors". Their main function is to "control the fission rate" of "Uranium and/or Polonium". The rods are capable of absorbing the excess neutrons projected released during nuclear fission, without themselves undergoing fission. They are generally inserted into the core of a nuclear reactor and is adjusted accordingly to operate under the desired environment.