Nuclear Power Engineering
The disintegration rate of a radioactive element

Progressively decreases
Remains constant throughout
Progressively increases
May increase or decrease depending on the material

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

Be a good absorber of neutrons
Have high density, but low heat transfer co-efficient
Be capable of attaining high temperature, only when it is pressurised
Be free from radiation damage and non-corrosive

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