Nuclear Power Engineering
Uranium is recovered from its ore (pitchblende) by

Dissolving in water
Leaching with sulphuric acid
Smelting in a furnace
Froth floatation technique

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Nuclear Power Engineering
A control rod

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

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Nuclear Power Engineering
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

It will completely disintegrate in four months
3/4th of it will disintegrate in two months
It will completely disintegrate in two months
L/8th of it will remain intact at the end of four months

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