Physics
When two semiconductors of pand n-type are brought in contact, they form p-n junction which acts like a/an

Rectifier
Oscillator
Conductor
Amplifier

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Physics
Solids have definite shapes.This is because

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

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