Physics
A nuclear reactor is said to have become 'critical' when

It is shut down to avoid explosion
It starts emitting dangerous radioactive radiations
It is ready to produce controlled energy
It stops due to malfunctioning

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure of a person increases at high altitudes
The pressure of blood in capillaries is greater than the outside pressure
The blood pressure fluctuates and finally decreases drastically
The pressure at high altitudes is greater than that on the plains

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