Computer Science
Multiple Choice
Questions
(MCQs) – Sets 22
with Detailed Explanations
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SET 22 – Computer Science MCQs
✅ No repetition from Sets 1–21
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a compiler?
A. Hardware device
B. Program that translates high-level code into machine code
C. Input device
D. Operating system
✅ Correct Answer: B
Explanation:
A compiler is a system software that converts an entire program written in a high-level language into machine language before execution. It checks for syntax errors and generates an executable file. Compilers help programs run faster and are commonly used for languages like C and C++.
2. What is an interpreter?
A. Hardware device
B. Translates code line by line during execution
C. Storage device
D. Input unit
✅ Correct Answer: B
Explanation:
An interpreter translates and executes high-level code one line at a time. It does not create a separate executable file. Interpreters are useful for debugging because they stop at the line where an error occurs. Python and JavaScript commonly use interpreters.
3. What is the main difference between compiler and interpreter?
A. Speed only
B. Memory only
C. Method of code translation
D. Hardware usage
✅ Correct Answer: C
Explanation:
The main difference lies in how code is translated. A compiler converts the entire program at once, while an interpreter translates code line by line. Compiled programs generally run faster, whereas interpreted programs are easier to debug and modify during development.
4. What is machine language?
A. Human-readable code
B. Programming language
C. Binary language understood by computer
D. Operating system
✅ Correct Answer: C
Explanation:
Machine language is the lowest-level programming language consisting of binary digits (0s and 1s). It is directly understood by the computer’s CPU. Machine language executes very fast but is difficult for humans to write and understand, leading to the development of higher-level languages.
5. What is assembly language?
A. High-level language
B. Binary code
C. Low-level language using mnemonics
D. Application software
✅ Correct Answer: C
Explanation:
Assembly language is a low-level programming language that uses mnemonic codes instead of binary instructions. It is easier to understand than machine language but still closely related to hardware. Assembly language requires an assembler to convert it into machine code.
6. What is a high-level programming language?
A. Machine language
B. Hardware language
C. User-friendly programming language
D. Binary code
✅ Correct Answer: C
Explanation:
High-level programming languages are designed to be easy for humans to read and write. They use English-like statements and abstract hardware details. Examples include Python, Java, and C++. High-level languages improve productivity and are widely used in software development.
7. What is a translator in programming?
A. Input device
B. Hardware unit
C. Software that converts code from one form to another
D. Storage medium
✅ Correct Answer: C
Explanation:
A translator is system software that converts code written in one programming language into another form, usually machine code. Examples include compilers, interpreters, and assemblers. Translators enable computers to understand and execute programs written by humans.
8. What is an assembler?
A. Application software
B. Translates high-level language
C. Converts assembly language to machine code
D. Operating system
✅ Correct Answer: C
Explanation:
An assembler is a system program that translates assembly language instructions into machine language. It converts mnemonic codes into binary form. Assemblers make it possible for programmers to write low-level code that is easier than machine language but still efficient.
9. What is syntax in programming?
A. Program logic
B. Program output
C. Rules of writing programs
D. Hardware instruction
✅ Correct Answer: C
Explanation:
Syntax refers to the set of rules that define how programs must be written in a programming language. It includes correct spelling, punctuation, and structure. Syntax errors occur when these rules are violated, preventing the program from running correctly.
10. What is program documentation?
A. Writing code
B. Executing program
C. Written explanation of program
D. Error fixing
✅ Correct Answer: C
Explanation:
Program documentation is the written description explaining how a program works. It includes comments, user manuals, and technical guides. Documentation helps users and developers understand, maintain, and update software efficiently, especially in long-term projects.
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