Power Plant Engineering
A nuclear reactor is said to be critical when the neutron population in the reactor core is

Constant
Rapidly increasing leading to the point of explosion
Decreasing from the specified value
Reduced to zero

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Power Plant Engineering
Ferrite material is

The most fissionable material
The basic fuel for nuclear paints
The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
Basic raw material for nuclear plants

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