Example 1 · difficulty 4/5
An ideal transformer has 100 turns in its primary and 500 turns in its secondary. When the secondary delivers a current of 2 A, the current drawn from the 40 V primary supply is:
- A. 0.4 A
- B. 2 A
- C. 50 A
- D. 10 A
2018 source guide · Physics
NEET 2018 Physics Alternating Current Questions
Use this page to connect the official 2018 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.
What to master
phasors, reactance, impedance, resonance, power and transformers.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 2 · difficulty 3/5
An AC voltage is given by v = v₀ sin(ωt), where T = 2π/ω is the time period. Starting from t = 0, the earliest instant at which the instantaneous voltage equals its own rms value is:
- A. T/4
- B. T/8
- C. T/2
- D. T/16
Example 3 · difficulty 3/5
An alternating voltage is represented by v = 100 sin(ωt). If it first reaches its positive maximum after 0.01 s from a zero crossing with positive slope, the angular frequency is:
- A. 50π rad s⁻¹
- B. 25π rad s⁻¹
- C. 100π rad s⁻¹
- D. 50 rad s⁻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
Frequently asked questions
Are these official NEET 2018 Physics Alternating Current 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.