Computer Science
Multiple Choice
Questions
(MCQs) – Sets 38
with Detailed Explanations
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SET 38 – Computer Science MCQs
✅ No repetition from Sets 1–37
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is cybersecurity?
A. Computer speed
B. Protection of systems and data
C. Internet browsing
D. Software installation
✅ Correct Answer: B
Explanation:
Cybersecurity refers to the practice of protecting computers, networks, and data from unauthorized access, attacks, and damage. It includes using passwords, antivirus software, and firewalls. Cybersecurity is important to prevent hacking, data theft, and online fraud.
2. What is malware?
A. Hardware failure
B. Legal software
C. Malicious software
D. Internet service
✅ Correct Answer: C
Explanation:
Malware is any software designed to harm computers or steal information. Examples include viruses, worms, and spyware. Malware can slow systems, damage files, or steal personal data. Users must use antivirus tools and safe browsing practices to stay protected.
3. What is antivirus software?
A. Game software
B. File manager
C. Program that detects and removes malware
D. Web browser
✅ Correct Answer: C
Explanation:
Antivirus software is designed to detect, prevent, and remove malicious programs from a computer. It scans files and monitors system activity. Regular updates help protect against new threats and ensure system security.
4. What is phishing?
A. Online shopping
B. Network setup
C. Fake attempt to steal personal information
D. Software update
✅ Correct Answer: C
Explanation:
Phishing is a cybercrime where attackers trick users into revealing personal information such as passwords or bank details. It often appears as fake emails or websites. Users should verify sources and avoid clicking suspicious links.
5. What is a strong password?
A. Simple word
B. User name
C. Combination of letters, numbers, and symbols
D. Birthdate
✅ Correct Answer: C
Explanation:
A strong password includes uppercase and lowercase letters, numbers, and symbols. It is hard to guess and protects accounts from unauthorized access. Using unique passwords for different accounts improves security and reduces risk.
6. What is two-factor authentication?
A. Single password
B. Antivirus scan
C. Two-step verification method
D. Data backup
✅ Correct Answer: C
Explanation:
Two-factor authentication adds an extra layer of security by requiring two forms of verification. It usually combines a password with a code sent to a phone or email. This method greatly reduces unauthorized access risks.
7. What is data encryption?
A. Data deletion
B. Data backup
C. Converting data into unreadable format
D. Data sharing
✅ Correct Answer: C
Explanation:
Data encryption converts readable data into a coded form to prevent unauthorized access. Only authorized users with a decryption key can read it. Encryption is used in banking, online communication, and data storage for security.
8. What is cybercrime?
A. Computer repair
B. Online learning
C. Crime using computers or internet
D. Software development
✅ Correct Answer: C
Explanation:
Cybercrime involves illegal activities performed using computers or the Internet. Examples include hacking, identity theft, and online fraud. Cyber laws exist to prevent such crimes and protect users and organizations.
9. What is spyware?
A. Antivirus
B. Hardware device
C. Software that secretly collects information
D. Operating system
✅ Correct Answer: C
Explanation:
Spyware is a type of malware that secretly monitors user activities and collects personal data without permission. It can track browsing habits and steal sensitive information. Using antivirus software helps detect and remove spyware.
10. What is digital footprint?
A. Computer virus
B. Network speed
C. Online data left by user activities
D. Hardware mark
✅ Correct Answer: C
Explanation:
A digital footprint is the trail of data created by users when they use the Internet. This includes social media posts, searches, and online purchases. Managing digital footprints is important for privacy and online reputation.
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