Class 12 · Physics
Nuclei NEET Questions
100 verified questionsNCERT chapter mappedFree practiceAutomatic error log
Build recall in Nuclei through active solving. This bank covers the complete chapter with original NEET-style MCQs, worked explanations and chapter-level NCERT provenance—without pretending original questions are previous-year questions.
Practice Nuclei free →Question preview
Three examples from the live 100-question bank. Answers appear after attempting them in practice mode.
Example 1 · 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 2 · 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
Example 3 · difficulty 2/5
A freshly prepared radioactive source has activity R₀. After a time interval equal to three mean lives (3τ) of the nuclide, its activity will be closest to:
- A. about 37% of R₀
- B. about 50% of R₀
- C. about 5% of R₀
- D. about 14% of R₀
The chapter mastery loop
- 1. Attempt firstExpose recall gaps before rereading.
- 2. Classify the missConcept, careless, rushed or guessed.
- 3. Re-practiceReturn until the error pattern disappears.
Frequently asked questions
How many Nuclei NEET questions are available?
NeetVellum publishes 100 verified questions for this chapter. Free accounts use the daily UG quota; UG Pro removes it.
How should I revise Nuclei for NEET?
Attempt questions before rereading, classify each miss, revisit the exposed NCERT concept, then re-practice until the error pattern disappears.