Solution: Matching Electronic Components with Properties

This question requires matching the electronic components in List-I with their corresponding descriptions or characteristics in List-II.

a. Photodiode Matching

A Photodiode is a semiconductor device that converts light into an electrical signal. Its key characteristic is that its reverse current increases with light intensity. Therefore, photodiode matches with iii.

b. LASER Matching

LASER (Light Amplification by Stimulated Emission of Radiation) devices rely on stimulated emission. Certain types of LASERs, particularly semiconductor lasers, are constructed using materials that are classified as degenerate semiconductors due to high doping levels. Thus, LASER matches with iv.

c. Solar Cell Matching

A Solar cell is designed to convert solar energy (light) directly into electrical energy. This process means the device is a source of power, hence its power consumption is negative (it generates power). Solar cell matches with ii.

d. Opto-coupler Matching

An Opto-coupler (or optoisolator) uses light to provide electrical isolation between two circuits. It transfers signals while preventing high voltages in one circuit from affecting the other. Therefore, opto-coupler matches with i.

Final Matching

Based on the analysis:

• Photodiode (a) corresponds to iii.
• LASER (b) corresponds to iv.
• Solar cell (c) corresponds to ii.
• Opto-coupler (d) corresponds to i.

The correct code representing this match is a - iii, b - iv, c - ii, d - i.