Original revision introduction and starter practice. Full learning texts are available through the publisher links below. This guide is not a CBSE-issued solution manual.
Revision introduction
Python lists are ordered and mutable; tuples are ordered and immutable. Indexing begins at zero. Use clear variable names and trace each statement before guessing an output. A conditional selects a branch; a loop repeats a block. Respect privacy, copyright and responsible use of computing systems.
Curriculum navigation
Computer Systems and Organisation
Computational Thinking and Programming – I
Society, Law and Ethics
Consult the current official syllabus for examinable sections, project-only content, practicals, prescribed texts and exclusions. A unit index does not override those boundaries.
Original practice
What is len([2,4,6])?
3
2
6
12
Worked answer
3
len counts the three list elements.
Full publisher materials and answer resources
CBSE 11 Computer Science · syllabus · CBSE · 2026-27 The current official syllabus defines examinable content, internal assessment, practicals and prescribed books. Unit names in the app are a navigation index; consult this document for exclusions and assessment boundaries.
NCERT · Computer Science · NCERT · 2026-27 Official book selector with chapter PDFs and complete-book download. A textbook may contain material outside the assessed syllabus; follow the linked current syllabus.
KVS student support material · Class 11 · Kendriya Vidyalaya Sangathan · 2026-27 Use the 2026–27 support-material folders linked by the school. These are KVS teaching/revision resources, not CBSE official marking schemes. Subject availability varies; older packs must be mapped to the current syllabus.
DIKSHA · curriculum learning resources · Ministry of Education / DIKSHA · Current portal Choose CBSE/NCERT, Class 11, subject and medium. This is a searchable portal, not a promise of a specific playable lesson.