Physics
The reflector of a search light is a :

Cylindrical mirror
Concave mirror
Plane mirror
Convex mirror

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP