Physics
The base of an electric iron is brightly polished mainly

To make it rust-proof
To make it more durable
To make it smooth and frictionless
To reduce heat loss by radiation

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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
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
The ball will travel towards the center of the circle and fall down

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