Physics
Which one of the following determines the sharpness of image in a camera ?

The focal length of the lens
The exposure time
The aperture
Size of the camera

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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 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
It will fall down at the same place where the string breaks
None of these

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Physics
Superconductors are substances which

offer high resistance to the flow of current
conduct electricity at high temperatures
offer no resistance to the flow of electricity
conduct electricity at low temperature

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