Looking for the 11th computer science book? NCERT prints Class 11 Computer Science as two official textbooks — Computer Science (11 chapters) and Informatics Practices (8 chapters) — and both are linked below with their official NCERT PDFs. This page, maintained for the 2026-27 academic session, tells you which of the two you need before you open either.
The split matters because a chapter number alone does not tell you which book to open. Both books open with a Computer System chapter, and Chapter 5 is Getting Started with Python in the Computer Science book but a data-handling chapter in the Informatics Practices book. So a number on its own can point to two different topics.
Class 11 computer science NCERT PDFs at a glance
The table below names both books, how many chapters each holds, how many printed pages each runs, and where to open each book.
| Book | Chapters | Printed pages | Book page |
|---|---|---|---|
| Computer Science | 11 | 252 | Computer Science (coming soon) |
| Informatics Practices | 8 | 174 | Informatics Practices (coming soon) |
One detail in the table gives the book away before you open it: the PDF filename prefix. Files starting with kecs belong to Computer Science; files starting with keip belong to Informatics Practices. So kecs105.pdf is Computer Science Chapter 5, while keip105.pdf is Informatics Practices Chapter 5 — the two chapters whose topics do not match.
How to use the Class 11th computer science NCERT book
The official subject name decides the book. If your subject is Computer Science, you use the 11-chapter Computer Science book. If your subject is Informatics Practices, you use the 8-chapter Informatics Practices book.
Teachers usually say the subject name rather than the book title — “bring your Computer Science book tomorrow” — so that name is the first clue. The same name appears on your timetable, so a quick check there settles it.
To confirm the file, open the official Chapter 1 of the Computer Science textbook, Computer System, from ncert.nic.in — it is the same free PDF NCERT publishes for classroom use and a reliable check of the edition your school follows.
For Informatics Practices, the official Chapter 1 of the Informatics Practices textbook, also Computer System, from ncert.nic.in is the starting file, and opening it shows the exact edition and layout before you download the rest.
Which 11th computer science book is your CBSE Class 11 computer science textbook?
Three checks settle it. Use them in this order:
- By subject name. Computer Science and Informatics Practices are two different subjects with two different books. The name on your timetable is the answer.
- By chapter number. The Computer Science book runs chapters 1–11; the Informatics Practices book runs chapters 1–8. The same number can name different topics: Chapter 6 is Flow of Control in the Computer Science book (NCERT, p. 121) but Introduction to NumPy in the Informatics Practices book (NCERT, p. 95).
- By topic. Encoding schemes and number systems (NCERT, p. 27), functions, strings, tuples and societal impact appear only in the Computer Science book. Data handling, NumPy, database concepts and SQL appear only in the Informatics Practices book (NCERT, pp. 123, 144). Lists and dictionaries appear in both books — Computer Science chapters 9–10 (NCERT, pp. 189–228) and Informatics Practices chapter 4 (NCERT, pp. 55–80).
One point to notice: both books teach Python, but at different depths. Functions, strings and tuples appear only in the Computer Science book, while NumPy and database SQL appear only in the Informatics Practices book.
What each book covers
Computer Science (252 printed pages across 11 chapters) starts with the computer system and encoding schemes, moves through problem solving with algorithms and flowcharts, then follows a full Python progression — control flow, functions, strings, lists, tuples and dictionaries — and closes with societal impact. It is the book for students whose subject is Computer Science.
Informatics Practices (174 printed pages across 8 chapters) covers the computer system and emerging trends, Python basics including lists and dictionaries, then data handling with statistical techniques, NumPy arrays, and databases with SQL. It is the book for students whose subject is Informatics Practices.
Related resources
Move from here to the full collection: browse the complete list of NCERT books or open the Class 11 hub to reach every subject in this class. For the two books on this page, the Computer Science book page and the Informatics Practices book page each carry the chapter list, chapter lengths and official PDF links for that book.
Sources and data verification
- The chapter counts, page ranges and page references on this page come from the NCERT Class 11 Computer Science textbook (kecs101–kecs111) and the NCERT Class 11 Informatics Practices textbook (keip101–keip108), official editions on ncert.nic.in.
- This page covers chapter counts, page ranges, named sections, indexed figures and exercise questions for both books. It does not cover the CBSE syllabus, marking schemes or optional material.
- This listing is maintained for the academic session named in the introduction to this page.
- NCERT settles textbook editions and PDFs; CBSE settles curriculum, syllabus and examinations.
Reference: NCERT Class 11 Computer Science textbooks, official editions on ncert.nic.in.
Frequently asked questions
How many NCERT books are there for Class 11 Computer Science?
Two. NCERT prints the subject as two official textbooks: Computer Science (11 chapters, 252 pages) and Informatics Practices (8 chapters, 174 pages). Which one you use depends on the subject you study.
Which book is my chapter in: Computer Science or Informatics Practices?
Start with the subject name on your timetable — that decides the book. If you only have a chapter number, be careful: both books open with a Computer System chapter, and Chapter 6 is Flow of Control in the Computer Science book (NCERT, p. 121) but Introduction to NumPy in the Informatics Practices book (NCERT, p. 95).
Are the Class 11 Computer Science and Informatics Practices PDFs official and free?
Yes. NCERT publishes both textbooks as free chapter-wise PDFs on ncert.nic.in — kecs101–kecs111 for Computer Science and keip101–keip108 for Informatics Practices. The links on this page go to those official files.
I study Informatics Practices — which NCERT book do I need?
You need the 8-chapter Informatics Practices book (keip101–keip108). It covers the computer system and emerging trends, Python basics with lists and dictionaries, data handling with statistical techniques, NumPy arrays, and databases with SQL (NCERT, pp. 1–174).
Do both Class 11 books teach Python?
Yes, but at different depths. Both books teach Python fundamentals. Functions, strings and tuples appear only in the Computer Science book, while NumPy and database SQL appear only in the Informatics Practices book.