Nuclear Power Engineering
'Heavy water' is termed as 'heavy' because it is

An oxide of heavier isotope of oxygen
A heavy liquid
Denser than water
An oxide of deuterium

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Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

Is not at all corrosive, even at a higher temperature
Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
Can't attain high temperature at normal pressure
None of these

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Nuclear Power Engineering
Plutonium

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

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