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

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

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The density of sea water is more than the density of river water

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Physics
Mirage is due to:

Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
Unequal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere

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