CBSE 12 Physics · U8
Atoms and Nuclei
CBSE Class 12 Physics Unit VIII: alpha-particle scattering, Rutherford model, Bohr hydrogen atom, hydrogen line spectra, nuclear composition and size, nuclear force, mass defect, binding energy, fission, and fusion.
Test yourself
A focused, distraction-free run through 25 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 8.1
Rutherford Scattering and Atomic Model
Alpha-particle scattering observations, nuclear atom, limitations of Rutherford's model
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Topic 8.2
Bohr Model of Hydrogen Atom
Bohr postulates, radius, velocity and energy of electron in nth orbit
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Topic 8.3
Hydrogen Energy Levels and Spectrum
Energy-level transitions and qualitative hydrogen spectral series
Topic 8.4
Nuclear Composition, Size, and Mass Defect
Nucleons, isotopes, isobars, nuclear radius relation, nuclear force, and mass defect
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Topic 8.5
Binding Energy, Fission, and Fusion
Binding energy per nucleon curve, stability, fission and fusion energy release
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