Physics
Fat can be seperated from milk in a cream seperator because of :

Centripetal Force
Cohesive Force
Centrifugal Force
Gravitational Force

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Physics
Stars twinkle because

None of these
the intensity of light emitted by them changes with time.
the distance of the stars from the earth changes with time.
the refractive index of the different layers of the earth's atmosphere ch

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Physics
A transformer

Converts DC to AC
Converts AC voltage to D.C. voltage
Is used to decrease or increase AC voltage
Converts electrical energy into mechanical energy

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