Computer Science
Multiple Choice
Questions
(MCQs) – Sets 14
with Detailed Explanations
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SET 14 – Computer Science MCQs
✅ No repetition from Sets 1–13
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a software bug?
A. A hardware device
B. A feature of software
C. An error or flaw in a program
D. A computer virus
✅ Correct Answer: C
Explanation:
A software bug is an error or flaw in a computer program that causes it to behave unexpectedly or produce incorrect results. Bugs can occur due to mistakes in logic, syntax, or design. Identifying and fixing bugs is an important part of software development to ensure programs work correctly and reliably.
2. What is a patch in software development?
A. A new operating system
B. A small update to fix issues
C. A hardware upgrade
D. A programming language
✅ Correct Answer: B
Explanation:
A patch is a small software update released to fix bugs, improve security, or enhance performance. Patches are usually smaller than full updates and focus on specific problems. Installing patches helps keep software stable and protected from vulnerabilities without changing major features.
3. What is the purpose of a CAPTCHA?
A. Speed up internet
B. Store passwords
C. Verify that a user is human
D. Encrypt data
✅ Correct Answer: C
Explanation:
CAPTCHA is a security feature used on websites to distinguish between humans and automated bots. It often involves selecting images or typing distorted text. CAPTCHA helps prevent spam, fake account creation, and automated attacks, making online platforms safer and more secure.
4. What is a data breach?
A. Data backup
B. Data compression
C. Unauthorized access to data
D. File deletion
✅ Correct Answer: C
Explanation:
A data breach occurs when sensitive or confidential information is accessed, stolen, or exposed without authorization. This can include personal details, passwords, or financial information. Data breaches can cause serious harm, so organizations use security measures like encryption and firewalls to protect data.
5. What is phishing?
A. Programming technique
B. Online shopping
C. Fraudulent attempt to steal information
D. Data recovery
✅ Correct Answer: C
Explanation:
Phishing is a cybercrime where attackers trick users into revealing personal information by pretending to be a trusted source. This often happens through fake emails or messages. Phishing attacks can lead to identity theft and financial loss, so users should verify links and messages carefully.
6. What is an SSD?
A. A type of software
B. A networking device
C. A fast storage device using flash memory
D. An input device
✅ Correct Answer: C
Explanation:
An SSD (Solid State Drive) is a storage device that uses flash memory instead of spinning disks. It is faster, more durable, and consumes less power than traditional hard drives. SSDs significantly improve system speed, making computers boot faster and applications load quickly.
7. What is digital divide?
A. Difference in computer brands
B. Gap between people with and without access to technology
C. Internet speed problem
D. Software error
✅ Correct Answer: B
Explanation:
The digital divide refers to the gap between individuals or communities that have access to digital technology and those that do not. This can affect education, employment, and communication. Reducing the digital divide is important for social equality and inclusive development in the digital age.
8. What is a smart device?
A. Manual machine
B. Device connected to the internet with advanced features
C. Basic electronic device
D. Offline computer
✅ Correct Answer: B
Explanation:
A smart device is an electronic device that can connect to the internet and perform advanced functions. Examples include smartphones, smart TVs, and smart home devices. These devices often use sensors and apps to provide automation, remote control, and enhanced user experience.
9. What is a log file?
A. Image file
B. Video file
C. File that records system activities
D. Audio file
✅ Correct Answer: C
Explanation:
A log file records events, errors, and activities occurring within a computer system or application. Log files help administrators and developers monitor system performance and troubleshoot issues. They are important for security analysis, auditing, and maintaining system reliability.
10. What is digital transformation?
A. Using typewriters
B. Converting paper to files only
C. Using digital technology to improve processes
D. Deleting old systems
✅ Correct Answer: C
Explanation:
Digital transformation is the process of using digital technologies to improve business operations, services, and customer experiences. It includes adopting cloud computing, automation, and data analytics. Digital transformation helps organizations become more efficient, competitive, and responsive to changing needs.
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