Physics
The bats can fly in the dark because

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

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

It will fall down at the same place where the string breaks
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
None of these
The ball will travel towards the center of the circle and fall down

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