To get an output 1 from the circuit shown in the figure, the input must be

The output of the given arrangement of logic gates for $A=0, B=1$ and $A=1, B=1$ will be

A germanium crystal is doped with arsenic atoms and indium atoms simultaneously. Number of arsenic atoms used $=5 \times 10^{22}$ per $\mathrm{m}^3$ and number of indium atoms used $=5 \times 10^{20}$ per $\mathrm{m}^3$, then resulting crystal is a/an

Assuming the diodes to be of silicon with forward resistance zero, the current $$i$$ in the following circuit is