PYQs
Practise questions grouped by chapter and source year.
Practice questions are organised using the years and labels in our source collection. Work through the solutions with your teacher; these are not a complete official examination paper.
Practice question 1
Source year: 20253 marksExplain crystal defects. [CBSE 2025]
Practice question 2
Source year: 20253 marksExplain Frenkel and Schottky defects in ionic crystals. [CBSE 2025]
Practice question 3
Source year: 20243 marksCalculate packing efficiency in FCC unit cell. [CBSE 2024]
Practice question 4
Source year: 20232 marksWhat are n-type and p-type semiconductors? [CBSE 2023]
Formulae
Revisit important relationships and quick revision formulae.
Packing Efficiency
FCC: 74%, BCC: 68%
Packing Efficiency
FCC: 74%, BCC: 68%, Simple Cubic: 52.4%
Number of Atoms
FCC: 4, BCC: 2, Simple Cubic: 1
Coordination Number
FCC: 12, BCC: 8, Simple Cubic: 6
Derivations
Work through the reasoning behind key concepts.
Packing Efficiency in FCC
Volume of atoms / Total volume × 100 = 74%
Notes
Build understanding with chapter guides and revision notes.
Comprehensive Notes: The Solid State
Introduction to The Solid State
These are the fundamental concepts and key takeaways for this chapter. Make sure to review these before exams.
- Key Concept 1
- Key Concept 2
- Important Definition
More detailed notes will be added here soon.
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