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

None of these
It will fall down at the same place where the string breaks
The ball will travel towards the center of the circle and fall down
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

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Physics
Rainbow is due to

ionisation of water deposits
refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets

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