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

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

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Nuclear Power Engineering
In a pressurised water reactor (PWR), the

Fuel is natural uranium and heavy water acts both as moderator & coolant
Coolant water is pressurised to prevent bulk boiling of water in the core
Use of moderator is not required
Coolant water boils in the core of the reactor

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