Physics
The locomotion of insects to the source of light is called :

Phototropic
Thermotactic
Hydrotropic
Phototactic

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Physics
In a bipolar junction transistor

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

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