Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Water has high surface tension
The density of salt solution exceeds the density of eggs
Egg absorbs salt from the solution and expands
Albumin dissolves in salt solution and egg becomes lighter

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

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals have higher thermal capacity than plastics
plastics have a higher thermal conductivity than metals
plastics have a lower density than metals
metals are good conductor of heat

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