CBSE Class 12 Computer Science Question Bank 2026-27

A complete question bank for CBSE Class XII Computer Science students, covering all 7 chapters of the syllabus using Python 3.x. Contains 281 questions across all chapters, every one followed by a complete answer with explanation. Includes 35 embedded diagrams and image-based questions throughout. Each chapter closes with a Key Terms summary box for quick revision.

Coverage — All 7 Chapters

Chapter 1 — Functions and Exception Handling: User-defined functions, types of arguments (positional, default, keyword, args/*kwargs), function return values, flow of execution, scope of variables (global/local), global keyword, exception handling with try-except-else-finally, built-in exceptions.

Chapter 2 — Computer Networks: ARPANET and Internet history, Networking devices, Topologies, LAN/WAN, Protocols, HTTP/SMTP/TCP.

Chapter 3 — File Handling and Stack: Text files, Binary files, CSV files, pickle module, seek/tell, Stack — PUSH/POP/PEEK implementation.

Chapter 4 — Database Management: RDBMS concepts, SQL DDL and DML, Joins, GROUP BY, Python–MySQL connectivity.

Chapter 5 — Strings and Lists: Indexing and slicing, all String methods, List methods, Linear Search.

Chapter 6 — Tuples, Dictionaries and Modules: Tuple operations, Dictionary methods, math/random/statistics modules.

Chapter 7 — Python Fundamentals: Data types, Operators, Type conversion, if/for/while control flow, Error types, Flowcharts.

Structure of Each Chapter

Every chapter follows the CBSE exam pattern across five sections: Section A — MCQs (1 mark each), Section B — Short Answer I (2 marks each), Section B — Short Answer II (3 marks each), Section C — Programming questions (4–5 marks each), and Section D — Long Answer questions (6 marks each). Every question is followed by a complete worked answer. Programming questions include full code with explanation. "Find the Output" and "Error Detection" questions are included throughout, in addition to write-a-program questions.

One Inconsistency to Note

The cover and table of contents correctly list 7 chapters. However, the preface states "this ebook covers all two chapters" — this is a clear copy-paste error from an earlier version. The actual content covers all 7 chapters.

How It's Designed to Be Used

Students are advised to write all code by hand before checking solutions, and to trace "Find the Output" questions line by line before reading the answer. The Key Terms box at the end of each chapter is recommended as a quick revision sheet before exams. The book is intended to supplement textbooks and classroom instruction, not replace them.

Disclaimer

This is an independent educational resource and is not affiliated with, endorsed by, or connected to CBSE or any government body. Python syntax and behaviour described is based on Python 3.x. Students are advised to cross-check all solutions and code with their subject teachers and official CBSE publications.