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

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

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Physics
Stars twinkle because

the distance of the stars from the earth changes with time.
None of these
the refractive index of the different layers of the earth's atmosphere ch
the intensity of light emitted by them changes with time.

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