Nuclear Reactions

The radio nuclide ${}_{90}{}^{234}\mathrm{Th}$ undergoes two successive ${\mathrm{\beta }}^{-}-$ decay and one $\alpha -$ decay respectively. The number of protons and mass number respectively of the resulting radio nuclide are:

Shields are designed to prevent the exposure of harmful radiations to people working in the nuclear reactor.

The material most commonly used for shielding is 

Why shields are used in nuclear reactor?

Which one of the given substance is used as a moderator in nuclear reactors?

What happens when neutrons are passed through a moderator?

The substance which reduces the speed of fast moving neutrons is called _____. 

List the important components of a nuclear power plant.

Reactor core is one of the important component of a nuclear reactor.

List any three parts of a nuclear reactor.

Which of the following is a part of a nuclear reactor?

The control rod in a nuclear reactor is made of.

Nuclear fission can be controlled by using control rods made up of boron.

Define radioactive transmutation?

Explain the term shielding in nuclear reactor.

Define moderator.

List the different parts of a nuclear reactor.

Name any three fertile material in nuclear reactor.

Uranium $238$ is a fertile material.