25 MOST IMPORTANT QUESTION AND ANSWER FOR CHSE 12TH PHYSICS CHAPTER- SEMICONDUCTOR ELECTRONICS

Weightage 7 Marks

Energy bands in conductors, semiconductors and insulators (qualitative idea only), p-type, ntype semiconductors, semiconductor diode, V-I characteristics in forward and reverse bias, diode as a half and full wave rectifier (centre tap), efficiency (no derivation). Special purpose p-n junction diodes: LED, photodiode, solar cell and Zener diode and their characteristics, Zener diode as a voltage regulator. Junction transistor, transistor action, Characteristics of transistor, transistor as an amplifier (CE configuration), basic idea of analog and digital signals, Logic gates (OR, AND, NOT, NAND, and NOR)