Physics
Absolute Zero is defined as

At which water boils at 298K
At which liquid Helium boils
At which the volume becomes zero
The temperature at which all molecular motion ceases

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The density of sea water is lesser than the density of river water
The sea is-deeper than the river
The density of sea water is more than the density of river water

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

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