Physics
The weakest of all fundamental forces is

Nuclear force
Gravitational force
Electrostatic force
Magnetic force

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Physics
In a bipolar junction transistor

The emitter has the least concentration of impurity
The base has the least concentration of impurity
The collector 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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Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The stone conveys the heat away from the feet more rapidly than the carpet
The floor and carpet are at different temperatures
The carpet is a better conductor of heat than the stone
The human body maintains a constant temperature

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