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 hydrogen balloon floats up because of

The pressure inside the balloon is more than the pressure outside it
Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in weight
Air pressure decreases with decrease in height

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