Physics
Suitable impurities are added to a semiconductor depending on its use. This is done in order to

increase its life
increase its electrical resistivity
increase its electrical conductivity
enable it to withstand higher voltages

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Physics
A dynamo is a device which

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

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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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