CBSE Class 12 Computer Science Sample Papers 2026-27

Prepare for your Class 12 CBSE Computer Science (Code 083) board exam with 15 full-length sample papers, each modelled on the current sample question paper pattern: 37 questions, 70 marks, 3-hour format. 200 pages, with a fully worked answer key and marking scheme after every paper.

What's Inside

Each paper follows the five-section structure: Section A (Q1–Q21, objective type, 1 mark each, including 2 Assertion-Reason questions), Section B (Q22–Q28, Very Short Answer, 2 marks each), Section C (Q29–Q31, Short Answer, 3 marks each), Section D (Q32–Q35, case-based and source-based questions with linked sub-parts, 4 marks each) and Section E (Q36–Q37, Long Answer, 5 marks each). Internal choices are provided in some questions. All programming answers are in Python.

Every program and query in the collection has been independently traced and executed to confirm its output before inclusion. Answer keys show the working, not just the result: MCQ answers carry the reasoning behind them, output questions are traced index by index, and SQL corrections show the fixed query in full.

Marking notes are attached question by question, showing how marks split between logic, syntax and output, for example half a mark for the correct choice and half for the reasoning. Programming answers in the board exam earn partial credit, and the keys are written so you can score yourself the way an evaluator would.

Every paper includes a labelled networking case study with a campus layout diagram showing block names, PC counts and the distance between blocks, followed by questions on server placement, device placement, cable layout and network type.

Topics Covered

Questions span the full Class 12 Computer Science syllabus. Python: data types and mutability, string, list and dictionary methods, slicing, functions, default arguments, scope and the global keyword, lambdas, tuple unpacking, 2D lists and matrices. Exception handling: try, except, else and finally, exception ordering, assert and AssertionError. Data structures: stacks and queues implemented with lists, bracket balancing, postfix evaluation, next-greater-element and running-minimum patterns. Recursion: string reversal, palindromes, Fibonacci and GCD, binary search, grid paths and subset counting. File handling: text, binary and CSV files, record updates, and combined stack-plus-file tasks such as browser history and undo. SQL: WHERE and HAVING, GROUP BY, aggregates, joins including LEFT JOIN and self-join, BETWEEN, IN, NOT IN and NOT LIKE, plus multi-clause capstone queries. Python-SQL connectivity: fetchone and fetchall, parameterised queries and exception-wrapped connections. Networking: topologies, devices, cabling, PAN, LAN, MAN and WAN, VoIP, VLAN segmentation, NAT, firewalls and WAN redundancy. Societal impact: IPR, plagiarism, patent infringement and cyber safety.

Difficulty Levels

Papers are graded across three sets of five: Easy (Papers 1–5), Moderate (Papers 6–10) and Difficult (Papers 11–15). The Easy set confirms concept recall. The Moderate set combines two concepts in one question, such as a function that also uses exception handling, or a join with GROUP BY and HAVING. The Difficult set chains several clauses and join types together, pairs recursion with exceptions or file handling, and adds analytical follow-ups to the networking case studies.

A topic coverage table at the front lists the key topics in all fifteen papers, including which SQL bug each debugging question is built around, so you can pick the paper that matches what you have just revised.

At a Glance

• 15 full-length sample papers, 200 pages

• 5 Easy, 5 Moderate and 5 Difficult

• 37 questions per paper (70 marks, 3 hours)

• Fully worked answer key and marking scheme for every paper

• Mark-split notes showing how partial credit is awarded

• Every program and query independently traced and executed

• A labelled campus network diagram in every paper

• Python-only programming answers

• Topic coverage table for planning revision

Disclaimer

This ebook is an independent publication by FutureTopper.in and is not affiliated with, endorsed by, or associated with the Central Board of Secondary Education (CBSE). These papers are designed for practice and self-assessment only and do not represent actual board examination papers. The content follows the CBSE Computer Science syllabus and sample paper pattern available at the time of writing. The Board may revise the pattern, syllabus or marking scheme, so students should cross-check against the current official CBSE circulars and sample papers for their examination year. While care has been taken to ensure accuracy, including tracing and verifying every program and query, minor errors may exist. Errors can be reported to contactfuturetopper@gmail.com.