Physics
The cause for the Tsunami, as deduced by the seismologists, is

Low pressure trough in the ocean
Deformation of sea floor and vertical displacement of water
Sudden change in the monsoon wind
Gravitational pull of the moon

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Physics
In the process of magnetisation of a bar

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

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