Question Frequency (NEET 2015–2024)
| Sub-topic | Approx. Frequency | Typical Question Style |
|---|---|---|
| Logic gate truth table identification | 1–2 Q/year | "Identify the gate from truth table" or "find output" |
| n-type vs p-type identification | 1 Q/year | "Dopant X is added → what type?" |
| Special diode bias & application | 1 Q/year | Match diode to bias/application |
| Mass action law numerical | 0–1 Q/year | "Find minority carrier concentration" |
| p-n junction properties | 1 Q/year | Depletion region, barrier potential, biasing |
| De Morgan's theorem | 0–1 Q/year | Simplify Boolean expression |
| Rectifier frequency | 0–1 Q/year | "Output frequency of full-wave rectifier?" |
| Band gap & material type | 0–1 Q/year | Classify conductor/semiconductor/insulator |
Most Tested NEET Patterns
Pattern 1 — Truth Table → Gate Name NEET provides a truth table and asks you to identify the gate. Strategy: Look at the output column — if only 1 row gives output 0, it's NAND. If only 1 row gives output 1, it's NOR. If output 1 only when ALL inputs 1, it's AND. If output 0 only when ALL inputs 0, it's OR.
Pattern 2 — Carrier Concentration Numerical Given n_i and n_e (after doping), find n_h. ALWAYS apply: n_h = n_ / n_e. Units must match (all per or all per c). NEET 2023 tested exactly this.
Pattern 3 — Diode Application MCQ "Which device converts light to electricity with no external bias?" → Solar cell. "Which is used as voltage regulator?" → Zener (reverse bias). Know all four special diodes and their unique features.
Pattern 4 — Electrical Neutrality Trap "n-type semiconductor is ___." Options include "negatively charged." Correct: electrically neutral. This trap appears in ~1 of every 3 semiconductor questions across the NEET years.
NEET Marks Distribution Estimate
Chapter contributes approximately 6–8 marks (2–3 questions × 2 marks each + 0–1 bonus) in recent NEET papers. Logic gates alone account for ~4 marks. High ROI chapter for exam preparation.