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Security (Computer Science) Solved Questions & Notes (2026) - Apex Rankers

General Competitive Exams > Computer Science > Security

50 Total Solved Questions
~75 mins Estimated Reading Time
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Security

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25 Questions in this set
Select the best option for the following modern Computer Aptitude Test questions (covering AI, Cloud, Cybersecurity, and Modern Hardware):
Q. 1 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is the primary purpose of a 'VPN'?
A
Speed up internet
B
Block ads
C
Encrypt data traffic
✓ Correct
D
Store files
💡 Step-by-Step Explanation & Concept Rationale
A Virtual Private Network creates a secure, encrypted tunnel for data transmission.
Q. 2 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Phishing' in cybersecurity?
A
A hardware failure
B
Social engineering
✓ Correct
C
A type of virus
D
A network protocol
💡 Step-by-Step Explanation & Concept Rationale
Phishing involves tricking users into revealing sensitive information via fake messages.
Q. 3 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What does 'MFA' stand for in security?
A
Multi-File Access
B
Multi-Factor Authentication
✓ Correct
C
Main Frame Array
D
Mode Filter Access
💡 Step-by-Step Explanation & Concept Rationale
MFA requires two or more verification methods to access an account.
Q. 4 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Ransomware'?
A
Free software
B
Malware that locks data
✓ Correct
C
A type of browser
D
A cloud service
💡 Step-by-Step Explanation & Concept Rationale
Ransomware encrypts user files and demands payment for the decryption key.
Q. 5 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is the purpose of a 'Firewall'?
A
Cool the CPU
B
Block unauthorized access
✓ Correct
C
Store passwords
D
Speed up Wi-Fi
💡 Step-by-Step Explanation & Concept Rationale
Firewalls monitor and control incoming/outgoing network traffic based on rules.
Q. 6 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Zero Trust' in cybersecurity?
A
No security
B
Never trust, always verify
✓ Correct
C
Trusting only admins
D
Using no passwords
💡 Step-by-Step Explanation & Concept Rationale
Zero Trust assumes every access request is a threat until fully verified.
Q. 7 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is '2FA'?
A
Two File Access
B
Two-Factor Authentication
✓ Correct
C
Fast Access
D
Folder Access
💡 Step-by-Step Explanation & Concept Rationale
2FA adds an extra layer of security beyond just a password.
Q. 8 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Encryption'?
A
Deleting files
B
Scrambling data for security
✓ Correct
C
Compressing folders
D
Sending emails
💡 Step-by-Step Explanation & Concept Rationale
Encryption converts information into a secret code to prevent unauthorized access.
Q. 9 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Malware'?
A
Useful tools
B
Malicious software
✓ Correct
C
Hard drive brand
D
A type of mouse
💡 Step-by-Step Explanation & Concept Rationale
Malware is any software intentionally designed to cause damage or disruption.
Q. 10 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Biometric' login?
A
Using a key
B
Fingerprint or face ID
✓ Correct
C
Using a USB stick
D
Pattern lock
💡 Step-by-Step Explanation & Concept Rationale
Biometrics use physical characteristics for secure authentication.
Q. 11 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Botnet'?
A
A robot shop
B
Network of infected devices
✓ Correct
C
A high-speed router
D
A security team
💡 Step-by-Step Explanation & Concept Rationale
A botnet is a group of compromised computers controlled by a hacker.
Q. 12 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Sandbox' in security?
A
A literal sandbox
B
Isolated testing environment
✓ Correct
C
A web browser
D
A backup drive
💡 Step-by-Step Explanation & Concept Rationale
A sandbox allows programs to run in isolation to prevent damage to the system.
Q. 13 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Social Engineering'?
A
Building a park
B
Tricking people for info
✓ Correct
C
A coding style
D
A social app
💡 Step-by-Step Explanation & Concept Rationale
It is the psychological manipulation of people into divulging secrets.
Q. 14 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'SQL Injection'?
A
A database fix
B
A cyber attack
✓ Correct
C
A data entry tool
D
A secure login
💡 Step-by-Step Explanation & Concept Rationale
Malicious SQL code is inserted into input fields to manipulate a database.
Q. 15 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Keylogger'?
A
A password tool
B
Spyware recording keys
✓ Correct
C
A keyboard cleaner
D
A type of key
💡 Step-by-Step Explanation & Concept Rationale
Malware that records what you type to steal passwords/info.
Q. 16 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Trojan Horse'?
A
A fast computer
B
Malware disguised as good
C
A wooden toy
D
Malware disguised as legitimate
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Malware that tricks users into running it by appearing as a useful program.
Q. 17 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Malvertising'?
A
Adware
✓ Correct
B
Malicious advertising
C
Free ads
D
Ad blocking
💡 Step-by-Step Explanation & Concept Rationale
Injecting malicious code into legitimate online advertising networks.
Q. 18 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What does 'Zero-day' refer to in cybersecurity?
A
A new software launch
B
An unpatched vulnerability
C
A trial period
D
A vulnerability unknown to the software creator
✓ Correct
💡 Step-by-Step Explanation & Concept Rationale
Zero-day exploits target flaws before a fix or "patch" has been developed.
Q. 19 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Shift Left' in the context of security?
A
Moving text left
B
Testing security earlier in development
✓ Correct
C
Using older software
D
Deleting data
💡 Step-by-Step Explanation & Concept Rationale
It emphasizes addressing security vulnerabilities at the start of the software lifecycle.
Q. 20 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Honeypot' in cybersecurity?
A
A fast server
B
A decoy system to lure hackers
✓ Correct
C
A password manager
D
A data backup
💡 Step-by-Step Explanation & Concept Rationale
Honeypots are used by security teams to study hacker behavior and deflect attacks.
Q. 21 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'DDoS'?
A
Data Delete System
B
Distributed Denial of Service
✓ Correct
C
Dual Data Operative
💡 Step-by-Step Explanation & Concept Rationale
A DDoS attack floods a target with traffic from multiple sources to crash it.
Q. 22 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'XSS' (Cross-Site Scripting)?
A
A styling language
B
A type of cyber attack
✓ Correct
C
A file format
D
A network tool
💡 Step-by-Step Explanation & Concept Rationale
XSS involves injecting malicious scripts into trusted websites to target users.
Q. 23 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'OAuth 2.0' primarily used for?
A
File transfer
B
Authorization and delegated access
✓ Correct
C
Sending emails
D
Database queries
💡 Step-by-Step Explanation & Concept Rationale
It allows apps to access user data from other services (e.g., Log in with Google).
Q. 24 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is a 'Salt' in cryptography?
A
A corrupted file
B
Random data added to a password hash
✓ Correct
C
A physical key
D
A network error
💡 Step-by-Step Explanation & Concept Rationale
Salting prevents hackers from using pre-calculated tables to crack passwords.
Q. 25 Computer Aptitude Test
Difficulty: Medium (1 Mark)
What is 'Asymmetric Encryption'?
A
Single key for both
B
Two different keys (Public and Private)
✓ Correct
C
No key required
D
Encrypting only half
💡 Step-by-Step Explanation & Concept Rationale
This method allows secure communication without sharing the private key.
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