Computer Science
Multiple Choice
Questions
(MCQs) – Sets 12
with Detailed Explanations
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SET 12 – Computer Science MCQs
✅ No repetition from Sets 1–11
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a data type in programming?
A. A computer device
B. A category of data a variable can store
C. A software error
D. An operating system
✅ Correct Answer: B
Explanation:
A data type defines the kind of value a variable can store in a program, such as numbers, characters, or true/false values. Data types help the computer understand how much memory to allocate and what operations can be performed. Examples include integer, float, character, and boolean data types.
2. What is source code?
A. Computer hardware
B. Machine language
C. Program written in a high-level language
D. Output of a program
✅ Correct Answer: C
Explanation:
Source code is the original program written by a programmer using a high-level programming language like Python or C++. It is readable by humans and must be translated into machine language before execution. Source code helps programmers create, modify, and understand software easily.
3. What is a syntax error?
A. Error in logic
B. Error due to wrong output
C. Error caused by incorrect program rules
D. Hardware failure
✅ Correct Answer: C
Explanation:
A syntax error occurs when a program violates the rules of the programming language. Examples include missing brackets or incorrect spelling of commands. Syntax errors prevent the program from running and are usually detected by the compiler or interpreter, helping programmers fix mistakes quickly.
4. What is a logic error?
A. Typing mistake
B. Hardware fault
C. Error that causes incorrect output
D. Virus infection
✅ Correct Answer: C
Explanation:
A logic error occurs when a program runs without crashing but produces incorrect results due to faulty logic. For example, using the wrong formula in a calculation. Logic errors are difficult to detect because the program executes successfully, but the output is not what was intended.
5. What is debugging?
A. Writing programs
B. Executing programs
C. Finding and fixing errors in programs
D. Installing software
✅ Correct Answer: C
Explanation:
Debugging is the process of identifying and correcting errors in a program. Errors may be syntax, logic, or runtime errors. Debugging tools help programmers step through code and inspect values. Debugging improves program reliability and ensures correct output and smooth performance.
6. What is a variable in programming?
A. A fixed value
B. A storage location for data
C. A computer device
D. An error message
✅ Correct Answer: B
Explanation:
A variable is a named storage location in a program used to hold data that can change during execution. For example, a variable can store a student’s marks. Variables make programs flexible and reusable by allowing data to be updated and manipulated throughout the program.
7. What is a loop?
A. A condition
B. A function
C. A structure that repeats instructions
D. A data type
✅ Correct Answer: C
Explanation:
A loop is a programming structure that repeats a set of instructions until a condition is met. Loops reduce repetition in code and save time. Examples include “for” and “while” loops. Loops are commonly used for tasks like printing lists or processing multiple values.
8. What is a flow of control in programming?
A. Computer speed
B. Order in which instructions are executed
C. Memory size
D. Program output
✅ Correct Answer: B
Explanation:
Flow of control refers to the order in which program instructions are executed. It includes sequence, selection, and repetition. Proper control flow ensures programs run logically and efficiently. It helps programmers manage decisions and loops effectively in software development.
9. What is an array?
A. A type of error
B. A collection of multiple values of the same type
C. An operating system
D. An output device
✅ Correct Answer: B
Explanation:
An array is a data structure used to store multiple values of the same data type in a single variable. Each value is accessed using an index. Arrays are useful for handling large sets of data, such as storing marks of students or list of numbers.
10. What is a function in programming?
A. A data type
B. A loop
C. A block of code that performs a specific task
D. An error
✅ Correct Answer: C
Explanation:
A function is a block of reusable code designed to perform a specific task. Functions help break programs into smaller parts, making them easier to understand and maintain. They reduce code duplication and improve program structure, efficiency, and readability.
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