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

Amplifier
Oscillator
Rectifier
Conductor

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Physics
Circuit breaker usually operate under

Transient state of short-circuit current
Steady state of short-circuit current
After D. C. component has ceased
Sub-transient state of short-circuit current

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Physics
Solids have definite shapes.This is because

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

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