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Computer 12 Past Paper 2025 | Notely

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All Computer 12 papers

Class 12 · Past paper

Computer 12 past paper 2025

48 published questions in this index. The full practice view lets you work through them and track your own attempts.

12 MCQs36 written questionsPractise this paper

Question index

1
Which phase of SDLC is used to assess the strengths and weaknesses of a proposed system?
MCQ1 marksannual
1
Give any three comparisons between **distributed** and **time-sharing** operating systems.
Part B3 marksannual
1
Explain five states of a **process**. Also discuss five features of **thread** with respect to process.
Part C5 marksannual
2
Which of the following operating systems allows multiple users to use the computer system simultaneously?

This is a skimmable index, not a replacement for the study surface. Open the practice view to answer questions and use the linked study material.

MCQ1 marksannual

2

Differentiate between `void *ptr1;` and `int *ptr2;`

Part B3 marksannual

2

What is meant by **file handling**? Explain binary and text files in C++.

Part C5 marksannual

3

Which of the following DOS commands is used to display the contents of directory?

MCQ1 marksannual

3

Write a C++ program to determine whether the given number is divisible by 7 or not.

Part B3 marksannual

3

Why are **design** and **development** phases of SDLC important? Discuss how are both phases related with each other?

Part C5 marksannual

4

Write a C++ program to input distance in kilometres and display in meters. ($1 \text{ km} = 1000 \text{ m}$).

Part B3 marksannual

4

Discuss two features of **OOP (Object Oriented Programming)** that enables code reusability in different classes and provides multiple ways of functionality usage.

Part C5 marksannual

5

Which of the following escape sequences is used to play a beep sound during execution?

MCQ1 marksannual

5

What is meant by **function overloading**? Enlist two advantages.

Part B3 marksannual

5

Write a C++ code to input time in seconds and display time in seconds, minutes and hours. e.g., 5466 seconds = 1 hour 31 minutes and 6 seconds.

Part C5 marksannual

6

Which of the following operators has highest precedence?

MCQ1 marksannual

6

What is meant by **implementation** in SDLC? Briefly explain any two implementation methods.

Part B3 marksannual

6

Write a C++ program that reads an alphabet and prints whether it is: a. Vowel or consonant b. Lowercase or uppercase

Part C5 marksannual

7

Which of the following is a valid case in switch structure?

MCQ1 marksannual

7

Write a C++ program to print the following output using a single statement: "I can wait"

Part B3 marksannual

7

Write a C++ program to input five numbers in array, display these numbers in reverse order, also display their average.

Part C5 marksannual

8

Which C++ statement will cause the body of a loop to execute ten times?

MCQ1 marksannual

8

Write a C++ program to print the following sequence using any loop: 2, 5, 8, 11.

Part B3 marksannual

8

Write a program to input two numbers and display the greater number using **inline function**.

Part C5 marksannual

9

The smallest subscript using `int a[10]` declaration is:

MCQ1 marksannual

9

Identify and correct the errors in the following code segment: `int a[10];` `a[10.2]=30;` `a[-1]=20;`

Part B3 marksannual

10

Null character in strings is represented by the following symbol:

MCQ1 marksannual

10

Complete the given code to print following series: 1, 1, 2, 3, 5, 8

Part B3 marksannual

11

$a++;$ can also be written as:

MCQ1 marksannual

11

Predict output of the following code segment: `char S1[10]="NBC", S2[10]="nbc", S3[10];` `cout << strcmp(S1, S2) << strlen(S2);` `strcat(S1, S2);` `cout << S1;`

Part B3 marksannual

12

In the given C++ code `Class st { ... };`, the element `st(){}` is:

MCQ1 marksannual

12

Rewrite the following code using **do-while** loop:

Part B3 marksannual

13

When reading one character at a time from a file, which of the following functions is used?

MCQ1 marksannual

13

Why are `3xy`, `void` and `your(age)` invalid variable names?

Part B3 marksannual

14

Compare **private** and **public** access specifiers.

Part B3 marksannual

15

How does **constructor** differ from **destructor**? (any three differences)

Part B3 marksannual

16

Write down three differences between **formal** and **actual** parameters.

Part B3 marksannual

17

What is **control statement**? Write down the purpose of any two examples.

Part B3 marksannual

18

Briefly explain the use of any three **file opening modes**.

Part B3 marksannual

19

Write C++ statements for the following: a. Declare an array to store floating point numbers in $3 \times 3$ matrix b. Store $10.5$ at first location c. Display the element present…

Part B3 marksannual

20

Differentiate between **pre-test** and **post-test** loops with examples.

Part B3 marksannual

21

Why is `cin.get()` used instead of `cin` when working with strings?

Part B3 marksannual

22

Differentiate between `(=)` and `(==)` in C++ with examples.

Part B3 marksannual

23

Predict the output: `int a[5], i;` `a[0]=2;` `for(i=1; i<4; i++) {` `a[i]=a[i-1]*2;` `cout << a[i] << endl;` }

Part B3 marksannual

24

Write down the purpose of asterisk (*) in the following statements: a. $c = a * b;$ b. `float *p = &a;` c. `*p = 90;`

Part B3 marksannual

25

Write down any three responsibilities of a system analyst.

Part B3 marksannual

26

Write down any three features of **Windows Operating System**.

Part B3 marksannual

27

Predict output of following code segment: `int i;` `for(i=1; i<=5; i++) {` `if (i % 2 == 0)` `continue;` `cout << i; }`

Part B3 marksannual

28

Rewrite using **if-else** statement: $s = (a > 0) ? a * a : a * a * a;$

Part B3 marksannual