Nuclear Power Engineering
Ordinary water is not used as a moderator because, it

Absorbs neutrons
Has a low absorption cross-section
Does not absorb neutrons
Has a low scattering cross-section

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Nuclear Power Engineering
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

All of these
Melting point, hence can be subjected to higher temperature
Resistance to effects of irradiation
Density ; hence core volume for a given power output would be smaller

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