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

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

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus changes whereas its atomic number does not change
The mass number of the nucleus does not change whereas its atomic number changes
Neither the mass number nor the atomic number of the nucleus changes
Both the mass number and the atomic number of the nucleus change

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Presence of gravity outside but not inside the spacecraft
Absence of gravity outside
Fact that spacecraft in the orbit has no energy
Acceleration in the orbit which is equal to the acceleration due to gravity outside

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