(i) Name the type of a diode whose characteristics are shown in figure (a) and (b).
(ii) What does the point P in fig. (a) represent?
(iii) What does the points P and Q in fig. (b) represent?

<p>This is a &nbsp;Short Answer Type Questions as classified in NCERT Exemplar</p><p><strong>Explanation-</strong> <strong> (i) </strong>The characteristic curve (a) is of Zener diode and curve (b) is of solar cell.<br><strong> (ii)</strong> The point P in fig. (a) represents Zener break down voltage.<br><strong> (iii)</strong> In fig. (b), the point Q represents zero voltage and negative current. It means light falling on solar cell with atleast minimum threshold frequency gives the current in opposite direction to that due to a battery connected to solar cell. But for the point Q, the battery is short circuited. Hence represents the short circuit current.<br>In fig. (b), the point P represents some positive voltage on solar cell with zero current<br>Through solar cell.It means, there is a battery connected to a solar cell which gives rise to the equal and Opposite current to that in solar cell by virtue of light falling on it.<br>As current is zero for point P, hence we say P represents open circuit voltage.</p>

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