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

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

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Physics
The nature of fuse wire is

Low resistance and low melting point.
Low resistance and high melting point.
High resistance and low melting point.
High resistance and high melting point.

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Physics
In a conductor

The forbidden energy gap is very narrow
The forbidden energy gap is very wide
There is no conduction band
The valence band and the conduction band overlap each other

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