Computer Science
Multiple Choice
Questions
(MCQs) – Sets 1
with Detailed Explanations
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10 Computer Science MCQs with answers and detailed examples.
1. What is a computer?
A. A machine that only calculates
B. An electronic device that processes data
C. A machine that prints documents
D. A device used only for gaming
✅ Correct Answer: B
Explanation:
A computer is an electronic device that accepts input, processes data according to instructions, stores information, and produces output. For example, when you type a document in MS Word, the keyboard provides input, the CPU processes it, memory stores it, and the screen shows the output. Computers are used in education, banking, healthcare, and many other fields.
2. Which part of the computer is called the “brain”?
A. RAM
B. Hard Disk
C. CPU
D. Monitor
✅ Correct Answer: C
Explanation:
The CPU (Central Processing Unit) is called the brain of the computer because it performs all calculations and decision-making tasks. It processes instructions from software and hardware. For example, when you open a browser, the CPU interprets commands, performs calculations, and controls other components to execute tasks efficiently.
3. What does RAM stand for?
A. Read Access Memory
B. Random Access Memory
C. Run Access Memory
D. Readable Active Memory
✅ Correct Answer: B
Explanation:
RAM stands for Random Access Memory. It is temporary memory used to store data that the computer is currently using. For example, when you open applications like a browser or music player, they are stored in RAM for quick access. When the computer is turned off, RAM data is erased.
4. Which of the following is an input device?
A. Printer
B. Monitor
C. Keyboard
D. Speaker
✅ Correct Answer: C
Explanation:
A keyboard is an input device because it allows users to enter data into the computer. For example, typing letters, numbers, and commands using a keyboard sends input to the computer for processing. Input devices help communicate instructions, while output devices display or produce results.
5. What is software?
A. Physical components of a computer
B. Programs and instructions
C. Input devices
D. Storage devices
✅ Correct Answer: B
Explanation:
Software refers to programs and instructions that tell the computer what to do. Examples include Windows, Linux, MS Word, and mobile apps. Without software, hardware cannot function. Software helps perform tasks such as writing documents, browsing the internet, or playing games.
6. Which of the following is system software?
A. MS Word
B. Paint
C. Operating System
D. Calculator
✅ Correct Answer: C
Explanation:
An operating system is system software that manages hardware and software resources. Examples include Windows, macOS, and Linux. It allows users to interact with the computer and controls memory, processes, and files. Without an operating system, application software cannot run.
7. What is a hard disk used for?
A. Input data
B. Display output
C. Store data permanently
D. Process instructions
✅ Correct Answer: C
Explanation:
A hard disk is a storage device used to store data permanently, even when the computer is turned off. For example, documents, videos, software, and operating systems are saved on the hard disk. It provides large storage capacity compared to RAM.
8. Which language is called a low-level language?
A. Python
B. Java
C. Assembly Language
D. C++
✅ Correct Answer: C
Explanation:
Assembly language is a low-level programming language because it is closely related to machine language. It uses symbols and mnemonics instead of binary code. It is fast and efficient but difficult to understand. High-level languages like Python are easier for humans to read and write.
9. What is the full form of CPU?
A. Central Program Unit
B. Central Processing Unit
C. Control Processing Unit
D. Central Power Unit
✅ Correct Answer: B
Explanation:
CPU stands for Central Processing Unit. It performs arithmetic, logical operations, and controls the execution of instructions. For example, calculations in Excel or commands in games are processed by the CPU. It works together with RAM and storage to run programs smoothly.
10. What is the purpose of an operating system?
A. To design websites
B. To manage computer hardware and software
C. To write programs only
D. To play music
✅ Correct Answer: B
Explanation:
An operating system manages hardware, software, memory, files, and user interaction. Examples include Windows and Linux. It acts as a bridge between the user and the computer. Without an operating system, users cannot run applications or control computer resources efficiently.
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