Example 1 · difficulty 4/5
A silicon diode with a knee (cut-in) voltage of 0.7 V is forward biased in series with a 90 Ω resistor across an ideal 5.0 V battery. The steady current in the circuit is closest to:
- A. 52 mA
- B. 56 mA
- C. 63 mA
- D. 48 mA
2018 source guide · Physics
NEET 2018 Physics Semiconductor Electronics Questions
Connect the official 2018 paper with current Physics practice without labelling original previews as PYQs.
200 original questions · explicit provenance labels
PhysicsPlate 72
NeetVellum atlas · fig. physics
72
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 2 · difficulty 1/5
Which energy-band description best explains the high electrical conductivity of a metal?
- A. Its highest occupied band is partially filled, or it overlaps the next higher band
- B. Its valence band is completely full and separated from an empty conduction band by a large gap
- C. Its forbidden energy gap increases rapidly when an electric field is applied
- D. Its electrons remain permanently bound in covalent bonds
Example 3 · difficulty 1/5
At ordinary temperatures, why does an insulator have negligible electrical conductivity?
- A. Its conduction band is completely filled with mobile electrons
- B. Its large forbidden gap prevents appreciable thermal excitation into the conduction band
- C. Its valence and conduction bands strongly overlap
- D. Its atoms supply an equal number of electrons and holes
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
Frequently asked questions
Are these official NEET 2018 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 2018 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.