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प्रश्न
Why does nose start bleeding on high mountains?
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उत्तर
On mountains, the atmospheric pressure is quite low. As such, nose bleeding may occur due to excess pressure of blood over the atmospheric pressure.
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संबंधित प्रश्न
State two experiences that made you think that air exerts pressure.
Explain why holes are made in hanging banners and hoardings.
Give reason for the following:
Water does not run out of a dropper unless its rubber bulb is pressed.
Give reason for the following :
Two holes are made in a sealed oil tin to take out oil from it.
A partially inflated balloon is placed inside a bell jar connected to a vacuum pump. On creating vacuum inside the bell jar, balloon gets more inflated. How does the pressure change: increase, decrease or remains same, inside the (a) bell jar, (b) balloon?
State two uses of a barometer.
Give two reasons for use of mercury as a barometric liquid.
What is an aneroid barometer? Draw a neat and labelled diagram to explain its construction and working.
Give reason:
Air pressure decreases with increasing altitude.
Briefly explain the concept of variation of atmospheric pressure.
