Physics
In the process of magnetisation of a bar

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

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Physics
The bats can fly in the dark because

They can see the objects in darkness
They generate ultrasonic sound waves
They have weak legs and are likely to be attacked by predators
They generate flashes of light

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