Physics
Suitable impurities are added to a semiconductor depending on its use. This is done in order to

increase its electrical resistivity
increase its electrical conductivity
enable it to withstand higher voltages
increase its life

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Physics
Solids have definite shapes.This is because

The forces of cohesion of the molecules within are very much less in them
The forces of cohesion are very large
The forces of adhesion are less
The forces of adhesion are large

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