Computer Science
Multiple Choice
Questions
(MCQs) – Sets 8
with Detailed Explanations
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SET 8 – Computer Science MCQs
✅ No repetition from Sets 1–7 & 9
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is data processing?
A. Deleting information
B. Converting raw data into meaningful information
C. Storing files only
D. Printing documents
✅ Correct Answer: B
Explanation:
Data processing is the process of collecting raw data and transforming it into useful information. For example, marks entered into a computer are processed to generate a report card. Computers perform data processing quickly and accurately using calculations, sorting, and analysis, which helps in decision-making in schools, offices, and businesses.
2. Which device is used to record sound into a computer?
A. Speaker
B. Monitor
C. Microphone
D. Printer
✅ Correct Answer: C
Explanation:
A microphone is an input device used to record sound into a computer. It converts sound waves into digital signals. Microphones are used for voice recording, online classes, video conferencing, and speech recognition. They play an important role in multimedia applications and communication technology.
3. What is the full form of PDF?
A. Portable Data File
B. Personal Document Format
C. Portable Document Format
D. Printed Data Form
✅ Correct Answer: C
Explanation:
PDF stands for Portable Document Format. It is used to share documents in a fixed layout that looks the same on all devices. PDFs are commonly used for ebooks, forms, and official documents. They maintain formatting, images, and fonts, making them reliable for sharing and printing.
4. What is a hacker?
A. A computer teacher
B. A software developer
C. A person who gains unauthorized access to systems
D. A hardware technician
✅ Correct Answer: C
Explanation:
A hacker is a person who tries to access computer systems or networks without permission. Hackers may steal data, damage systems, or spread malware. Some hackers, called ethical hackers, help improve security by finding weaknesses. Understanding hacking helps improve cybersecurity awareness and protection.
5. What is a software update?
A. Deleting programs
B. Installing hardware
C. Improving or fixing software
D. Formatting a computer
✅ Correct Answer: C
Explanation:
A software update is used to improve existing software by fixing bugs, adding features, or increasing security. For example, mobile apps receive updates regularly. Updates help protect systems from security threats and improve performance. Keeping software updated is important for smooth and safe computer usage.
6. What is the purpose of antivirus software?
A. Increase speed
B. Store data
C. Protect against malware
D. Print documents
✅ Correct Answer: C
Explanation:
Antivirus software protects computers from viruses, worms, and other malware. It scans files, detects threats, and removes harmful programs. Examples include Windows Defender and Avast. Antivirus software helps keep systems secure, protects personal data, and ensures the computer runs smoothly.
7. What is a file extension?
A. File size
B. File location
C. Ending part of a filename
D. File password
✅ Correct Answer: C
Explanation:
A file extension is the ending part of a file name that shows the file type. Examples include .txt, .jpg, and .pdf. File extensions help the operating system identify which program should open the file. They are important for organizing and managing digital files properly.
8. What is telecommunication?
A. Local data storage
B. Communication over long distances using technology
C. Writing programs
D. Printing documents
✅ Correct Answer: B
Explanation:
Telecommunication refers to the transmission of information over long distances using electronic means. Examples include phone calls, emails, and video conferencing. Telecommunication uses devices like mobile phones and satellites. It plays a vital role in global communication, business, education, and emergency services.
9. What is a command-line interface (CLI)?
A. Interface using graphics and icons
B. Interface controlled by mouse only
C. Interface using text commands
D. Input device
✅ Correct Answer: C
Explanation:
A command-line interface allows users to interact with a computer by typing text commands instead of using a mouse or icons. Examples include MS-DOS and Linux terminal. CLI is powerful and fast for experienced users but requires learning commands, making it less user-friendly for beginners.
10. What is green computing?
A. Fast computing
B. Gaming computers
C. Environment-friendly use of computers
D. Online learning
✅ Correct Answer: C
Explanation:
Green computing refers to using computers and technology in an environmentally responsible way. It includes reducing energy consumption, recycling electronic waste, and using eco-friendly devices. Green computing helps reduce pollution and conserve natural resources, making technology more sustainable for future generations.
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