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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Physics
The Hooke's law is valid for

Entire stress strain curve
Elastic as well as plastic region of the stress strain curve
Only proportional region of the stress strain curve
Entire elastic region of the stress strain curve

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