Since the exact circuit diagram and input/output waveforms are missing from the text, this solution is based on the standard NEET 2015 question it refers to. The typical circuit involves a diode in series with a load resistor $R_L$ acting as a half-wave rectifier. The input is a $10 \text{ V}$ peak-to-peak square wave (ranging from $-5 \text{ V}$ to $+5 \text{ V}$).

During the positive half-cycle (when the input is $+5 \text{ V}$), the p-n junction diode is forward-biased and conducts, dropping the entire $+5 \text{ V}$ across the load resistor $R_L$ (assuming an ideal diode). During the negative half-cycle (when the input is $-5 \text{ V}$), the diode is reverse-biased and acts as an open circuit, so no current flows and the voltage across $R_L$ is $0 \text{ V}$. Therefore, the output waveform is a half-wave rectified square signal containing only the positive half-cycles (from $0 \text{ V}$ to $+5 \text{ V}$).