Physics
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

8.5 A
24 A
0.41666666666667

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Physics
In a bipolar junction transistor

The base has the least concentration of impurity
The emitter has the least concentration of impurity
All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The collector has the least concentration 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 human body maintains a constant temperature
The floor and carpet are at different temperatures
The carpet is a better conductor of heat than the stone

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