Physics
Hydro-electric power is a:

non-renewable natural resource
Neither renewable nor non renewable resource
A mixture of renewable and non-renewable natural resource
Renewable natural resource

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Physics
In a bipolar junction transistor

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

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