Physics
Burns caused by steam are much severe than those caused by boiling water because

Steam pierces through the pores of body quickly
Steam is gas and engulfs the body quickly
Temperature of steam is higher
Steam has latent heat

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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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