CBSE Class 12 Computer Science Most Important Questions 2026 – High Scoring Topics to Pass Easily
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CBSE Class 12 Computer Science 2026 – Most Important Questions to Pass Easily
Computer Science is one of the most scoring subjects in CBSE Class 12 if you prepare Python, SQL, file handling, and networking properly. CBSE repeats similar coding patterns and theory questions every year.
This article covers the most expected questions for Computer Science Class 12 (2026 board exam) so that even average students can score 60+ marks easily.
CBSE Class 12 Computer Science Exam Pattern 2026
| Section | Marks |
|---|---|
| Theory Exam | 70 |
| Practical + Project | 30 |
| Total | 100 |
High-Scoring Units
| Unit | Marks | Priority |
|---|---|---|
| Programming in Python + Stack + Files | 40 | ⭐⭐⭐⭐⭐ |
| Database Management (SQL + Python connectivity) | 20 | ⭐⭐⭐⭐ |
| Computer Networks & Cyber Safety | 10 | ⭐⭐⭐ |
Unit-Wise Most Important Questions for CBSE Class 12 Computer Science 2026
Unit 1: Python Programming & Data Structures (40 Marks)
A. Python Basics & Functions
Important Questions
-
Difference between local and global variables.
-
Write a function to check prime number / palindrome / factorial.
-
Explain recursion with example.
-
Types of errors in Python.
-
Exception handling syntax.
B. Lists, Dictionaries & Strings
| Must Practice |
|---|
| List operations |
| Dictionary traversal |
| String slicing |
| Searching elements |
| Sorting |
Questions
-
Program to find largest element in a list.
-
Count vowels in a string.
-
Create dictionary and display values.
C. Stack (Data Structure)
Important
-
Define stack and LIFO principle.
-
Write Python program for push and pop.
-
Stack implementation using list.
D. File Handling (Very Important)
| File Types |
|---|
| Text |
| Binary |
| CSV |
Questions
-
Difference between text and binary files.
-
Program to write and read data from file.
-
Search a record in binary file.
-
Append data to file.
-
Explain file modes (r, w, a, rb, wb).
Unit 2: Computer Networks (10 Marks)
Important Theory Questions
-
Types of networks: LAN, MAN, WAN.
-
Network topologies with diagram.
-
Difference between hub, switch, router.
-
IP address and DNS.
-
Protocols: HTTP, FTP, SMTP, TCP/IP.
-
Cyber crimes examples.
-
Safety measures on internet.
Unit 3: Database Management & SQL (20 Marks)
A. Database Concepts
-
What is DBMS?
-
Advantages of DBMS over file system.
-
Primary key and foreign key.
-
Relational model terms.
B. SQL (Most Important)
| SQL Type | Commands |
|---|---|
| DDL | CREATE, ALTER, DROP |
| DML | INSERT, UPDATE, DELETE |
| DQL | SELECT |
Must Practice Queries
-
Create a table.
-
Insert records.
-
Display records using WHERE.
-
Use LIKE, BETWEEN, IN.
-
ORDER BY and DISTINCT.
-
Aggregate functions (COUNT, SUM, AVG).
-
GROUP BY and HAVING.
-
Simple JOIN.
C. Python–SQL Connectivity
-
Steps to connect Python with database.
-
Insert data using Python.
-
Fetch records using cursor.
Practical Exam Important Programs
| Area |
|---|
| File handling program |
| SQL queries |
| Stack program |
| Python menu-driven program |
| Project explanation |
One-Day Revision Plan for Computer Science
| Time | Topic |
|---|---|
| 2 hrs | Python programs |
| 1.5 hrs | File handling |
| 1 hr | SQL queries |
| 45 min | Networking |
| 45 min | Stack |
| 30 min | Theory revision |
Tips to Pass Computer Science Easily
- Practice Python daily
- Memorize SQL syntax
- Write clean code
- Use comments
- Revise file modes
- Practice output questions
- Prepare viva questions
- Complete project properly
Click Here to Know More about CBSE Class 12 Computer Science Syllabus 2025-26 | Unit Wise Topics & Exam Pattern Details: https://dekhocampus.com/news/cbse-class-12-computer-science-syllabus-2025-26
FAQs (Frequently Asked Questions)
Usually 2–3.
Strong Python + SQL + clean writing.
No, theory based.
Python programming (40 marks).
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