Physics
Danger signals are generally red as red light

Has lowest velocity
Undergoes least deviation
Is least bright
Gives comfort to eye

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

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

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