2021 source guide · Physics

NEET 2021 Physics Semiconductor Electronics Questions

Use this page to connect the official 2021 paper with current Physics practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.

Practice 120 verified questions →Check official NTA archive ↗

What to master

junction diodes, rectification, logic gates and elementary devices.

Original practice preview

These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.

Example 1 · difficulty 1/5

For an intrinsic semiconductor over its normal operating range, raising temperature generally causes its conductivity to

A. increase because more electron-hole pairs are generated
B. decrease because every electron becomes bound
C. remain exactly constant because n equals p
D. become zero because holes recombine instantly

Example 2 · difficulty 2/5

Which pair gives the approximate forbidden energy gaps of germanium and silicon at room temperature, respectively?

A. 1.1 eV and 0.7 eV
B. 0.7 eV and 1.1 eV
C. 0.07 eV and 0.11 eV
D. 7 eV and 11 eV

Example 3 · difficulty 2/5

An intrinsic semiconductor has n = p = 2.0 × 10¹⁶ m⁻³. If electron mobility is 0.14 m² V⁻¹ s⁻¹, hole mobility is 0.05 m² V⁻¹ s⁻¹, and e = 1.6 × 10⁻¹⁹ C, what is its conductivity?

A. 3.20 × 10⁻³ S m⁻¹
B. 6.08 × 10⁻³ S m⁻¹
C. 6.08 × 10⁻⁴ S m⁻¹
D. 1.90 × 10⁻² S m⁻¹

The evidence-first practice loop

1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
2. Attempt closed-bookExpose the concept or execution gap before rereading.
3. Repair and returnClassify the miss and re-practice after a delay.

Canonical chapter practice

Semiconductor Electronics →

Frequently asked questions

Are these official NEET 2021 Physics Semiconductor Electronics PYQs?

No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.

How should I use the NEET 2021 paper?

Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.