CBSE Class 12 Computer Science (083) Sample Paper 2023
The CBSE Class 12 Computer Science exam is notorious for testing both conceptual depth and practical debugging skills — and this paper trains you on both. Inside you'll find 15 questions spanning Python syntax and functions, data structures (lists, dictionaries, stacks, and queues), file I/O operations, SQL joins and query optimization, and the Python-SQL bridge using modules like sqlite3. The question styles mix multiple-choice conceptual traps, true/false statements designed to catch careless readers, and fill-in-the-blank code snippets that demand precision. This paper mirrors the official CBSE board's question distribution, difficulty ramps, and marking style for Class 12. By the end, you'll have a crystal-clear sense of which topics the examiners prioritize, how they phrase their "gotcha" options, and exactly how many seconds you can afford per question without panicking.
Questions in this quiz
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- Question 1
What will be the output of the following Python code?
def outer(x): def inner(y): return x + y return inner func = outer(5) print(func(3))
- Question 2
Which of the following statements about default parameters in Python functions is correct?
- Question 3
A function that calls itself to solve a smaller version of the same problem is called a _____ function.
- Question 4
If a list in Python is defined as L = [1, 2, 3, 4, 5], what is the result of L[1:4]?
- Question 5
A dictionary in Python is an unordered collection of key-value pairs.
- Question 6
Which data structure follows the LIFO (Last In, First Out) principle?
- Question 7
What is the result of executing the following code?
stack = [] stack.append(10) stack.append(20) print(stack.pop()) print(stack)
- Question 8
In Python file handling, the 'w' mode _____ the file if it exists.
- Question 9
Which SQL clause is used to filter rows based on a condition?
- Question 10
Consider two tables: Students(StudentID, Name) and Enrollments(EnrollmentID, StudentID, CourseID). To list all students and their enrollments, even if some students have no enrollments, which JOIN should be used?
- Question 11
The sqlite3 module in Python is used to connect to and query SQL databases.
- Question 12
What is the primary purpose of a PRIMARY KEY constraint in a database table?
- Question 13
Which of the following is a valid SQL query to count the number of rows in a table named 'Products'?