Why is there a critical size of fissile material in a nuclear reactor?

What is the function of moderator in a nuclear reactor ?

What is the role of controlling rods in a nuclear reactor ?

Cadmium and Boron rods are used in a nuclear reactor to

Why do all materials not act as conductors ?

Consider the following statements. A, B and identify the correct choice in the given answers (A) Density of a nucleus is independent of its mass number (B) Beryllium is used as moderator in nuclear reactors

Heavy water is used as moderator in a nuclear reactor. The function of the moderator is

Why is polyester quite suitable for making dress materials ?

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?