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
The main purpose of control rod in a nuclear reactor is to control the

Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Velocity of the secondary neutrons
Conversion of fissile material into fertile material
Emission of hazardous radiation

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Nuclear Power Engineering
A control rod

Is generally made of boron, hafnium or cadmium
Both B and C
Should have small absorption cross-section
Should have large absorption cross-section

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