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

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

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Nuclear Power Engineering
A homogeneous reactor is the one, in which the

Fissile atoms are evenly distributed throughout the mass of nuclear reactor
All of these
Same substance (e.g. heavy water) is used as moderator & coolant
The fuel and the moderator is mixed to form a homogeneous material

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