Physics
The ordinary and maximum tolerance limit of sound by human being is

65 db to 75 db (decibel)
60 db to 80 db (decibel)
50 db to 70 db (decibel)
70 db to 85 db (decibel)

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Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised

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Physics
Thermohaline circulation is mainly due to

Warmer, less dense water sinking in the ocean and cold water replacing it
Cold, dense ocean water sinking and warmer water replacing it
Warm water being added to the ocean due to industial waste
Winds causing circulation of ocean water

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