Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate
All of these
Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
Is a better neutron moderator as well

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Nuclear Power Engineering
Plutonium

Has much lower melting point (640°C ) compared to thorium (1690°C)
Neither A nor B
Both A & B
Is recovered from spent fuel from thermal nuclear reactor

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