Computer Science
Multiple Choice
Questions
(MCQs) – Sets 11
with Detailed Explanations
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SET 11 – Computer Science MCQs
✅ No repetition from Sets 1–10
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a register in a computer?
A. A storage device
B. A type of software
C. Very small, fast memory inside the CPU
D. An input device
✅ Correct Answer: C
Explanation:
A register is a very small and extremely fast memory unit located inside the CPU. It temporarily stores data, instructions, or addresses that the CPU is currently using. Because registers are inside the processor, they provide the fastest access speed, helping the computer perform operations quickly and efficiently.
2. What is the purpose of formatting a disk?
A. Installing antivirus
B. Deleting viruses only
C. Preparing a storage device for use
D. Increasing RAM
✅ Correct Answer: C
Explanation:
Formatting a disk prepares a storage device like a hard drive or USB for storing data. It organizes the disk into a structure that the operating system can use. Formatting removes existing data and fixes file system errors. It is often done before using a new storage device or reinstalling an operating system.
3. What is a Trojan horse in computing?
A. An antivirus tool
B. A hardware failure
C. A type of malware disguised as useful software
D. A programming language
✅ Correct Answer: C
Explanation:
A Trojan horse is a type of malicious software that looks like a legitimate program but performs harmful actions once installed. It may steal data, damage files, or give hackers access to the system. Trojans spread through fake downloads and email attachments, making cybersecurity awareness very important.
4. What does GPU stand for?
A. General Processing Unit
B. Graphic Program Utility
C. Graphics Processing Unit
D. Global Processing Unit
✅ Correct Answer: C
Explanation:
GPU stands for Graphics Processing Unit. It is responsible for rendering images, videos, and animations on a computer screen. GPUs are essential for gaming, video editing, and graphic design. They reduce the load on the CPU by handling complex graphical calculations efficiently.
5. What is an example of wearable technology?
A. Desktop computer
B. Smartwatch
C. Printer
D. Scanner
✅ Correct Answer: B
Explanation:
Wearable technology refers to electronic devices worn on the body. A smartwatch is a common example that tracks time, health data, and notifications. Wearable devices are used in fitness, healthcare, and daily life. They often connect to smartphones and use sensors to collect real-time data.
6. What is the main purpose of a hyperlink?
A. Store data
B. Format text
C. Connect one webpage or document to another
D. Protect information
✅ Correct Answer: C
Explanation:
A hyperlink is a clickable element that connects one webpage or document to another. It allows users to navigate easily through websites and online resources. Hyperlinks can link text, images, or buttons and are fundamental to how the World Wide Web works.
7. What is a slideshow presentation mainly used for?
A. Writing programs
B. Data storage
C. Presenting information visually
D. Internet browsing
✅ Correct Answer: C
Explanation:
A slideshow presentation is used to present information in a visual and organized way using slides. Software like PowerPoint is commonly used. Slides can include text, images, charts, and videos. Presentations are widely used in classrooms, meetings, and conferences to communicate ideas effectively.
8. What is digital footprint?
A. Computer hardware
B. Internet speed
C. Online record of user activities
D. Storage space
✅ Correct Answer: C
Explanation:
A digital footprint is the record of activities a person leaves online, such as social media posts, searches, and website visits. It can be active (intentional posts) or passive (data collected automatically). Managing digital footprints is important for privacy, safety, and maintaining a good online reputation.
9. What is the purpose of two-factor authentication (2FA)?
A. Increase internet speed
B. Improve graphics
C. Add extra security to accounts
D. Store passwords
✅ Correct Answer: C
Explanation:
Two-factor authentication adds an extra layer of security by requiring two forms of verification, such as a password and a code sent to a phone. Even if a password is stolen, 2FA helps prevent unauthorized access. It is commonly used in email, banking, and social media accounts.
10. What is a digital signature?
A. Handwritten name
B. Scanned image
C. Electronic method to verify authenticity of documents
D. Password
✅ Correct Answer: C
Explanation:
A digital signature is an electronic method used to verify the authenticity and integrity of digital documents. It ensures that a document has not been altered and confirms the identity of the sender. Digital signatures are widely used in online forms, legal documents, and secure communications.
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