JAC 12th Computer Science Objective MCQ 2026

10th Book 10th Solution 10th Model Paper Answer 12th Model Paper Answer 10th Book 10th Solution 10th Model Paper Answer 12th Model Paper Answer

Class 12th Computer Science – Objective MCQ

Chapter 1: Computer Fundamental

4 Questions
1

Q1. What is a computer?

A) Electronic machine
B) Mechanical machine
C) Biological machine
D) Electrical device
2

Q2. Who is known as the father of computer?

A) Alan Turing
B) Charles Babbage
C) Bill Gates
D) Steve Jobs
3

Q3. CPU stands for?

A) Central Process Unit
B) Central Processing Unit
C) Computer Processing Unit
D) Control Processing Unit
4

Q4. Which part of computer performs calculations?

A) Memory
B) ALU
C) Control Unit
D) Input Unit

Chapter 2: Number System

4 Questions
1

Q1. Which number system is used by computer?

A) Decimal
B) Binary
C) Octal
D) Hexadecimal
2

Q2. Base of decimal number system is?

A) 2
B) 8
C) 10
D) 16
3

Q3. How many digits are in binary system?

A) 2
B) 8
C) 10
D) 16
4

Q4. Hexadecimal number system uses symbols?

A) 0–7
B) 0–9
C) 0–9, A–F
D) 0–1

Chapter 3: Operating System and OPS Concept

4 Questions
1

Q1. Operating system is a?

A) Hardware
B) Application software
C) System software
D) Utility software
2

Q2. Which is an example of operating system?

A) MS Word
B) Windows
C) Excel
D) Photoshop
3

Q3. OS is responsible for?

A) Memory management
B) File management
C) Process management
D) All of these
4

Q4. OPS stands for?

A) Open Program System
B) Operating Program System
C) Operating System
D) Open Processing Software

Chapter 4: Algorithm and Flowchart

4 Questions
1

Q1. Algorithm is?

A) Program
B) Step-by-step procedure
C) Flowchart
D) Software
2

Q2. Flowchart is used to?

A) Write code
B) Show logic graphically
C) Store data
D) Execute program
3

Q3. Diamond symbol represents?

A) Start/Stop
B) Process
C) Input/Output
D) Decision
4

Q4. Algorithm must have?

A) Infinite steps
B) Finite steps
C) No output
D) No input

Chapter 5: Introduction (C++)

4 Questions
1

Q1. C++ was developed by?

A) Dennis Ritchie
B) Bjarne Stroustrup
C) James Gosling
D) Guido van Rossum
2

Q2. C++ is a?

A) Low level language
B) High level language
C) Machine language
D) Assembly language
3

Q3. C++ supports?

A) Procedural programming
B) Object oriented programming
C) Both A and B
D) None
4

Q4. Which symbol ends a C++ statement?

A) :
B) ;
C) .
D) ,

Chapter 6: Constants and Variables

4 Questions
1

Q1. Variable is used to?

A) Store fixed value
B) Store changing value
C) Print output
D) Execute loop
2

Q2. Constant means?

A) Changeable value
B) Fixed value
C) Variable value
D) Random value
3

Q3. Which is a valid variable name?

A) 1num
B) num-1
C) num_1
D) num 1
4

Q4. Which keyword is used to declare constant?

A) var
B) let
C) const
D) static

Chapter 7: Input-Output Statements

4 Questions
1

Q1. cin is used for?

A) Output
B) Input
C) Processing
D) Loop
2

Q2. cout is used for?

A) Input
B) Output
C) Storage
D) Decision
3

Q3. Which operator is used with cin and cout?

A) =
B) >> and <<
C) ==
D) ++
4

Q4. Header file for cin and cout?

A) stdio.h
B) conio.h
C) iostream
D) math.h

Chapter 8: Operators in C++

4 Questions
1

Q1. Which operator is used for addition?

A) *
B) –
C) +
D) /
2

Q2. Which is a relational operator?

A) =
B) ==
C) ++
D) +=
3

Q3. Logical AND operator is?

A) &
B) &&
C) ||
D) !
4

Q4. Increment operator is?

A) —
B) ++
C) ==
D) +=

Chapter 9: Control Statement

4 Questions
1

Q1. if statement is used for?

A) Looping
B) Decision making
C) Input
D) Output
2

Q2. Which statement is used for multiple conditions?

A) if
B) if-else
C) switch
D) goto
3

Q3. Default case is used in?

A) if
B) loop
C) switch
D) function
4

Q4. goto statement is?

A) Looping statement
B) Jump statement
C) Input statement
D) Output statement

Chapter 10: Loop Control Structure

4 Questions
1

Q1. Which loop executes at least once?

A) for
B) while
C) do-while
D) nested loop
2

Q2. for loop is used when?

A) Number of iterations is known
B) Number of iterations is unknown
C) Infinite loop
D) No condition
3

Q3. break statement is used to?

A) Continue loop
B) Exit loop
C) Restart loop
D) Pause loop
4

Q4. continue statement is used to?

A) Stop loop
B) Skip iteration
C) End program
D) Restart program

Chapter 11: Array

4 Questions
1

Q1. Array is used to store?

A) Single value
B) Multiple values of same type
C) Different data types
D) Only characters
2

Q2. Array index starts from?

A) 0
B) 1
C) 2
D) -1
3

Q3. Which array stores rows and columns?

A) Single array
B) One dimensional array
C) Two dimensional array
D) Character array
4

Q4. Which bracket is used in array?

A) ()
B) {}
C) []
D) <>

Chapter 12: Functions

4 Questions
1

Q1. Function is used to?

A) Repeat code
B) Organize program
C) Reduce code
D) All of these
2

Q2. main() is?

A) User defined function
B) Library function
C) Predefined function
D) Compiler function
3

Q3. Function call means?

A) Defining function
B) Using function
C) Ending function
D) Declaring variable
4

Q4. Return statement is used to?

A) End program
B) Send value back
C) Call function
D) Repeat function

Chapter 13: String

4 Questions
1

Q1. String is an array of?

A) Numbers
B) Characters
C) Integers
D) Floats
2

Q2. String ends with?

A) Null character
B) Space
C) New line
D) Dot
3

Q3. Header file for string functions?

A) stdio.h
B) conio.h
C) string.h
D) math.h
4

Q4. strlen() is used to?

A) Copy string
B) Compare string
C) Find length
D) Reverse string

Chapter 14: Structure

4 Questions
1

Q1. Structure is used to?

A) Store same data type
B) Store different data types
C) Create loop
D) Call function
2

Q2. Keyword used to define structure?

A) class
B) struct
C) union
D) define
3

Q3. Structure members are accessed using?

A) :
B) .
C) *
D) ->
4

Q4. Structure is a?

A) Built-in data type
B) User defined data type
C) Primitive data type
D) Loop structure

Important Link

JAC 12th Model Paper 2026 Download
JAC 12th Syllabus Download
JAC 12th Time Table Download
JAC 12th Result Download
Official Website J.A.C.

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