ISC Class 12 Computer Science Question Bank 2026-27

A complete question bank for ISC Class XII Computer Science students, covering all 9 chapters of the ISC theory syllabus. Contains original questions across all chapters, every one followed by a complete answer with explanation. Includes Java programming questions, algorithm traces, Boolean algebra problems, and HOTS questions throughout.

Coverage — All 9 Chapters

Chapter 1 — Boolean Algebra (Unit 1): Number Systems and Conversions, 1's and 2's Complement, Boolean Laws, De Morgan's Theorems, Logic Gates, Karnaugh Maps, SOP/POS forms, Half Adder and Full Adder.

Chapter 2 — The Central Processing Unit (Unit 2.1): ALU, Control Unit, Registers, Instruction Cycle, Buses, Von Neumann Architecture.

Chapter 3 — Memory, I/O Devices and Computer Networks (Units 2.2–2.4): Memory Hierarchy, SRAM/DRAM, Cache Memory, ROM types, Virtual Memory, I/O devices, Networking concepts.

Chapter 4 — Object-Oriented Programming in Java (Units 3.1–3.2): Encapsulation, Inheritance, Polymorphism, Abstraction, Classes and Objects, Java OOP implementation.

Chapter 5 — Arrays, Strings and Character Handling (Unit 3.3): 1D and 2D Arrays, String methods, StringBuilder, Character class handling.

Chapter 6 — Data Structures (Unit 3.4): Stack (LIFO — array implementation, push/pop/peek), Queue (FIFO — circular array, enqueue/dequeue), Singly Linked List (insert/delete/search/traverse), Recursion (factorial, Fibonacci, Tower of Hanoi, palindrome check, binary search).

Chapter 7 — Searching and Sorting Algorithms (Unit 3.5): Linear Search O(n), Binary Search O(log n), Bubble Sort with early termination, Selection Sort (minimum swaps), Insertion Sort — all with full traces and complexity analysis.

Chapter 8 — Exception Handling and File I/O (Unit 3.6): Exception hierarchy, Checked vs Unchecked exceptions, try/catch/finally, throw vs throws, Custom exceptions, FileReader/FileWriter, BufferedReader, try-with-resources, Append mode.

Chapter 9 — Cyber Ethics and IT Trends (Unit 4): Cybercrime, Phishing, Hacking, IT Act 2000, Digital Footprint, and related trends.

Structure of Each Chapter

Every chapter is divided into four sections following the ISC paper pattern: Section A — MCQ/Short Answer (1 mark each), Section B — Short Answer (4 marks each), Section C — Long Answer (8 marks each), and Application/HOTS questions (8 marks each). Every question is followed by a complete worked answer. For sorting questions, full pass-by-pass traces are shown. For Java programs, complete code with explanation is provided.

Practical Note

The preface specifically advises students to run every Java program rather than just reading the solutions, as the ISC practical exam requires writing and executing Java code. For sorting chapters, students are encouraged to practise writing traces by hand, and for data structures, to draw diagrams of stack frames, queue pointers, and linked list nodes.

Disclaimer

This is an independent educational resource and is not affiliated with, endorsed by, or connected to CISCE or any government body. All questions and programs are original. Students should verify all content against the current official CISCE syllabus.