Physics
When a ship enters the sea from a river

It sinks a little
It remains at the same level
It rises or sinks depending on the material it is made of
It rises a little

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Physics
A dynamo is a device which

Creates mechanical energy
Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy
Creates electrical energy

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Physics
In the process of magnetisation of a bar

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

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