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

Gravitational Force
Centripetal Force
Centrifugal Force
Cohesive Force

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Physics
Solar eclipse will take place when

the moon is between the sun and the earth
the earth is between the moon and the sun
the moon does not lie on the line joining the sun and the earth
the sun is between the moon and the earth

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Physics
In a bipolar junction transistor

All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The emitter has the least concentration of impurity
The base has the least concentration of impurity
The collector has the least concentration of impurity

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