2021 source guide · Physics

NEET 2021 Physics Modern Physics 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 318 verified questions →Check official NTA archive ↗

What to master

photoelectric effect, atomic models, spectra, nuclei and radioactivity.

Original practice preview

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

Example 1 · difficulty 4/5

An electron and an alpha particle have the same kinetic energy. Given mₐ ≈ 4mₚ and mₚ ≈ 1836mₑ, the ratio of the de Broglie wavelength of the electron to that of the alpha particle is approximately:

A. 1836
B. 42.8
C. 7344
D. 85.7

Example 2 · difficulty 1/5

A nucleus X with mass number A and atomic number Z undergoes one α-decay followed by one β⁻-decay. The mass number and atomic number of the final daughter nucleus are, respectively:

A. A − 4 and Z − 2
B. A − 4 and Z + 1
C. A − 4 and Z − 1
D. A − 2 and Z − 1

Example 3 · difficulty 2/5

The half-life of a radioactive nuclide is 20 min. The fraction of the initial number of nuclei that remains undecayed after 80 min is:

A. 1/8
B. 1/16
C. 1/32
D. 1/64

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

Dual Nature of Radiation and Matter →Atoms →Nuclei →

Frequently asked questions

Are these official NEET 2021 Physics Modern Physics 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.