At absolute zero temperature, an intrinsic semiconductor behaves as

The logic gate equivalent to the combination of logic gates shown in the figure is

In a transistor, if the collector current is $98 \%$ of emitter current, then the ratio of the base and collector currents is

In the given circuit, if $A=0, B=1$ and $C=1$ are inputs, then the values of $y_1$ and $y_2$ are respectively