Computer Science
Multiple Choice
Questions
(MCQs) – Sets 24
with Detailed Explanations
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SET 24 – Computer Science MCQs
✅ No repetition from Sets 1–23
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is data integrity?
A. Data deletion
B. Data accuracy and consistency
C. Data speed
D. Data size
✅ Correct Answer: B
Explanation:
Data integrity refers to maintaining the accuracy, consistency, and reliability of data throughout its lifecycle. It ensures that data is not altered or corrupted accidentally or intentionally. Methods like validation, access control, and backups help maintain data integrity in computer systems and databases.
2. What is authentication?
A. Data storage
B. Data sharing
C. Verifying user identity
D. Data encryption
✅ Correct Answer: C
Explanation:
Authentication is the process of verifying the identity of a user before allowing access to a system. It commonly uses passwords, biometrics, or security codes. Authentication prevents unauthorized access and protects sensitive data, playing a vital role in cybersecurity.
3. What is authorization?
A. Logging in
B. Verifying identity
C. Granting access rights
D. Encrypting data
✅ Correct Answer: C
Explanation:
Authorization determines what actions or resources a user is allowed to access after authentication. For example, an administrator has more permissions than a regular user. Authorization ensures users can only access what they are permitted, enhancing system security and control.
4. What is a digital certificate?
A. Hardware tool
B. Printed document
C. Electronic document proving identity
D. Virus
✅ Correct Answer: C
Explanation:
A digital certificate is an electronic document used to verify the identity of a website or user. Issued by trusted authorities, it helps secure online communication through encryption. Digital certificates are essential for secure websites and online transactions.
5. What is HTTPS?
A. Normal web protocol
B. Programming language
C. Secure version of HTTP
D. File format
✅ Correct Answer: C
Explanation:
HTTPS is the secure version of HTTP used for safe communication over the internet. It uses encryption to protect data exchanged between the browser and server. HTTPS ensures privacy, data integrity, and authentication, making online browsing and transactions safer.
6. What is a firewall rule?
A. Virus
B. Software update
C. Instruction controlling network traffic
D. Password
✅ Correct Answer: C
Explanation:
A firewall rule is a set of instructions that determine whether network traffic should be allowed or blocked. These rules help protect systems from unauthorized access and cyber threats. Proper firewall configuration is essential for maintaining network security.
7. What is malware?
A. Useful software
B. Computer hardware
C. Harmful software
D. Programming tool
✅ Correct Answer: C
Explanation:
Malware is malicious software designed to harm computers, networks, or users. Examples include viruses, worms, and spyware. Malware can steal data, damage systems, or disrupt operations. Antivirus software and safe browsing habits help prevent malware infections.
8. What is spyware?
A. Antivirus
B. Network device
C. Malware that secretly monitors users
D. System update
✅ Correct Answer: C
Explanation:
Spyware is a type of malware that secretly monitors user activity and collects personal information without consent. It can track keystrokes, browsing habits, or passwords. Installing trusted software and keeping systems updated helps reduce spyware risks.
9. What is a Trojan?
A. Antivirus program
B. Security patch
C. Malware disguised as legitimate software
D. Backup tool
✅ Correct Answer: C
Explanation:
A Trojan is a type of malware that appears as a useful program but performs harmful actions when executed. Unlike viruses, Trojans do not replicate themselves. They often spread through fake downloads and email attachments, making user awareness essential for prevention.
10. What is ransomware?
A. Backup software
B. Freeware
C. Malware that locks data for payment
D. Firewall
✅ Correct Answer: C
Explanation:
Ransomware is malicious software that encrypts a user’s data and demands payment to restore access. It can cause serious data loss and financial damage. Regular backups, updates, and avoiding suspicious links help protect against ransomware attacks.
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