Computer Science
Multiple Choice
Questions
(MCQs) – Sets 43
with Detailed Explanations
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SET 43 – Computer Science MCQs
✅ No repetition from Sets 1–42
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is programming?
A. Computer repair
B. Writing instructions for a computer
C. Hardware installation
D. Internet browsing
✅ Correct Answer: B
Explanation:
Programming is the process of writing instructions that a computer can understand and execute. These instructions are written using programming languages. Programming helps create software, applications, and systems that perform specific tasks such as calculations, data processing, and automation.
2. What is a programming language?
A. Human language
B. Set of rules to communicate with a computer
C. Hardware component
D. Network device
✅ Correct Answer: B
Explanation:
A programming language is a formal language used to write instructions for a computer. It provides syntax and rules that allow programmers to create programs. Examples include Python, Java, and C++. Programming languages make communication with computers possible.
3. What is algorithm?
A. Computer error
B. Programming language
C. Step-by-step solution to a problem
D. Hardware device
✅ Correct Answer: C
Explanation:
An algorithm is a clear, step-by-step set of instructions used to solve a problem or perform a task. Algorithms are independent of programming languages and help plan the logic of a program before coding, improving accuracy and efficiency.
4. What is flowchart?
A. Program code
B. Hardware diagram
C. Graphical representation of an algorithm
D. Data table
✅ Correct Answer: C
Explanation:
A flowchart is a diagram that visually represents the steps of an algorithm using symbols. It helps understand program logic easily. Flowcharts are useful in planning, debugging, and explaining how a program works.
5. What is compiler?
A. Translates code line by line
B. Converts entire program into machine code
C. Executes program
D. Edits program
✅ Correct Answer: B
Explanation:
A compiler is a software tool that converts an entire high-level program into machine language before execution. It checks for errors and produces an executable file. Compilers help improve program performance and efficiency.
6. What is interpreter?
A. Converts whole program
B. Executes machine code
C. Translates code line by line
D. Hardware tool
✅ Correct Answer: C
Explanation:
An interpreter translates and executes a program line by line. It stops execution if an error is found, making debugging easier. Languages like Python use interpreters, allowing fast testing and development of programs.
7. What is debugging?
A. Program writing
B. Error detection and correction
C. Program execution
D. Program storage
✅ Correct Answer: B
Explanation:
Debugging is the process of finding and fixing errors or bugs in a program. It ensures the program works correctly. Debugging tools help programmers identify mistakes and improve program reliability and performance.
8. What is syntax error?
A. Logic mistake
B. Runtime error
C. Error due to wrong grammar of language
D. Hardware fault
✅ Correct Answer: C
Explanation:
A syntax error occurs when the rules of a programming language are not followed. It prevents the program from running. Examples include missing semicolons or incorrect spelling of keywords. Syntax errors must be fixed before execution.
9. What is logical error?
A. Program crash
B. Syntax mistake
C. Program gives wrong output
D. Hardware failure
✅ Correct Answer: C
Explanation:
A logical error occurs when a program runs without crashing but produces incorrect results. These errors are difficult to detect because there are no error messages. Careful testing and debugging help identify logical mistakes.
10. What is runtime error?
A. Error during program writing
B. Error after program ends
C. Error during program execution
D. Syntax problem
✅ Correct Answer: C
Explanation:
A runtime error occurs while the program is running. It can cause the program to stop suddenly. Examples include division by zero or accessing invalid memory. Runtime errors require proper handling to ensure program stability.
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