MCQs

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1. What is the primary goal of security testing in API inspection?
   a. To check API response times
   b. To verify the API’s security features against potential vulnerabilities
   c. To test the user interface of the API
   d. To ensure the API functions as expected
   Answer: b. To verify the API’s security features against potential vulnerabilitiesqaautomation+1
2. Which of the following is a common security vulnerability detected during API inspection?
   a. SQL Injection
   b. Cross-Site Scripting (XSS)
   c. Cross-Site Request Forgery (CSRF)
   d. All of the above
   Answer: d. All of the abovetestdevjobs+1
3. What kind of attack occurs when an API does not properly validate user inputs?
   a. Cross-Site Scripting (XSS)
   b. Denial of Service (DoS)
   c. SQL Injection
   d. Both a and c
   Answer: d. Both a and cqaautomation+1
4. What vulnerability arises if an API leaks sensitive information via error messages?
   a. Data Injection
   b. Information Disclosure
   c. XML External Entity (XXE)
   d. Broken Object Level Authorization (BOLA)
   Answer: b. Information Disclosuretestdevjobs+1
5. Why is it essential to verify authentication mechanisms during API inspection?
   a. To allow anonymous access
   b. To ensure requests come from valid users or systems
   c. To speed up responses
   d. To handle session cookies
   Answer: b. To ensure requests come from valid users or systemsqaautomation+1
6. Which practice helps prevent SQL Injection vulnerabilities during API testing?
   a. Allow raw user inputs in SQL queries
   b. Use parameterized queries or prepared statements
   c. Rely only on database security
   d. Accept all API inputs without validation
   Answer: b. Use parameterized queries or prepared statementstestdevjobs+1
7. Testing if an API endpoint allows unauthenticated requests helps assess what?
   a. Response speed
   b. Authorization enforcement
   c. Data formatting
   d. Load balancing
   Answer: b. Authorization enforcementqaautomation+1
8. What role does encryption play in securing APIs?
   a. Improves server response time
   b. Ensures data is securely transmitted and unreadable by unauthorized users
   c. Allows easy data sharing
   d. Enables public API access
   Answer: b. Ensures data is securely transmitted and unreadable by unauthorized userstestdevjobs+1
9. What HTTP status code indicates a client is unauthorized to access an API resource?
   a. 200 OK
   b. 401 Unauthorized
   c. 404 Not Found
   d. 500 Internal Server Error
   Answer: b. 401 Unauthorizedqaautomation+1
10. What is Broken Object Level Authorization (BOLA) in API security?
    a. Ignoring input validation
    b. Users can access objects without proper authorization
    c. Weak SSL configurations
    d. Flawed rate limiting
    Answer: b. Users can access objects without proper authorizationwayground+1
11. What mechanism is commonly used to securely authenticate API users?
    a. API Keys in URL
    b. OAuth 2.0
    c. Plain HTTP authentication
    d. No authentication
    Answer: b. OAuth 2.0geeksforgeeks+2
12. What is the purpose of rate limiting in API security?
    a. Increase server load
    b. Restrict number of client requests within time period
    c. Allow unlimited access
    d. Improve client UI
    Answer: b. Restrict number of client requests within time periodexamradar+1
13. Which security measure protects API data in transit?
    a. HTTP
    b. HTTPS with TLS/SSL
    c. FTP
    d. Plain TCP
    Answer: b. HTTPS with TLS/SSLgeeksforgeeks+1
14. What is API spoofing?
    a. Faking API responses to users
    b. Impersonating legitimate users or systems to gain unauthorized access
    c. Intercepting data to slow responses
    d. Sending malformed data
    Answer: b. Impersonating legitimate users or systems to gain unauthorized accesstestdevjobs+1
15. Cross-Origin Resource Sharing (CORS) is used in API security to?
    a. Enable unrestricted cross-domain API requests
    b. Control which domains may access resources
    c. Speed up API response
    d. Encrypt payloads
    Answer: b. Control which domains may access resourcesexamradar+1
16. How can insufficient input validation affect API security?
    a. Improves performance
    b. Risks injection attacks and data compromise
    c. Enhances browser compatibility
    d. No effect
    Answer: b. Risks injection attacks and data compromiseexamradar+1
17. What is the security risk of storing API keys in public repositories?
    a. No risk
    b. API key theft and unauthorized API access
    c. Faster API responses
    d. Easier debugging
    Answer: b. API key theft and unauthorized API accessqaautomation+1
18. Which attack floods an API server with excessive requests to disrupt service?
    a. SQL Injection
    b. Cross-Site Scripting
    c. Denial of Service (DoS)
    d. Man-in-the-Middle
    Answer: c. Denial of Service (DoS)testdevjobs+1
19. What is the purpose of CSRF tokens in API security?
    a. Enable anonymous browsing
    b. Prevent unauthorized commands from users’ browsers
    c. Cache responses
    d. Log user activity
    Answer: b. Prevent unauthorized commands from users’ browserstestdevjobs
20. Which tool can be used for automated security testing of APIs?
    a. Postman Security Tests
    b. Microsoft Word
    c. Excel
    d. Photoshop
    Answer: a. Postman Security Testsgeeksforgeeks
21. What role does logging and monitoring play in API security?
    a. Detect malicious activity and anomalies
    b. Slow down API requests
    c. Store API keys
    d. Bypass authentication
    Answer: a. Detect malicious activity and anomaliesgeeksforgeeks+1
22. What is the significance of token expiry in securing APIs?
    a. Tokens last indefinitely
    b. Limits window of token misuse if compromised
    c. Confuses users
    d. No security impact
    Answer: b. Limits window of token misuse if compromisedgeeksforgeeks
23. How does incorrect implementation of authorization checks affect APIs?
    a. Causes crashes
    b. Allows unauthorized data access
    c. Improves speed
    d. Reduces security alerts
    Answer: b. Allows unauthorized data accesswayground+1
24. What is an effective way to protect sensitive data stored in APIs?
    a. Compression
    b. Encryption
    c. Caching
    d. Logging
    Answer: b. Encryptionqaautomation+1
25. What is the advantage of using API tokens over API keys?
    a. Easier to guess
    b. Tokens can be expired and revoked
    c. Tokens are static
    d. Tokens are publicly shared
    Answer: b. Tokens can be expired and revokedexamradar+1
26. Which HTTP status code means “Forbidden”?
    a. 401
    b. 403
    c. 404
    d. 200
    Answer: b. 403qaautomation+1
27. What is the goal of input validation in API security?
    a. Prevent malformed or malicious data
    b. Improve UI
    c. Speed up code
    d. Enable SQL injections
    Answer: a. Prevent malformed or malicious datatestdevjobs+1
28. What kind of attack occurs by exploiting XML parsers in APIs?
    a. SQL Injection
    b. XML External Entity (XXE) attack
    c. DOS
    d. Phishing
    Answer: b. XML External Entity (XXE) attackqaautomation+1
29. Which API security practice limits damage from brute force attacks?
    a. Disabling encryption
    b. Implementing rate limiting
    c. Sharing API keys with everyone
    d. Allowing unlimited requests
    Answer: b. Implementing rate limitingexamradar+1
30. What is the role of HMAC in API security?
    a. Encrypts data
    b. Adds secure signature for authentication and integrity
    c. Decrypts tokens
    d. Removes payload data
    Answer: b. Adds secure signature for authentication and integrityexamradar
31. Why is it important to test an API’s error responses?
    a. To ensure good user experience
    b. To detect unauthorized data leakage through error info
    c. To speed up API calls
    d. To encrypt responses
    Answer: b. To detect unauthorized data leakage through error infotestdevjobs+1
32. What is mass assignment vulnerability?
    a. Attacker modifies object fields not intended for modification
    b. Overloading API server
    c. Using same credentials twice
    d. None of the above
    Answer: a. Attacker modifies object fields not intended for modificationtestdevjobs
33. Which of these is a key security risk for APIs according to OWASP?
    a. Broken User Authentication
    b. Rate Limiting
    c. Caching
    d. Logging
    Answer: a. Broken User Authenticationwayground+1
34. What is the function of custom headers in API security?
    a. Add validation layer making API request forgery harder
    b. Speed up requests
    c. Reduce bandwidth
    d. Store cookies
    Answer: a. Add validation layer making API request forgery hardertestdevjobs
35. What does Same-Origin Policy (SOP) enforce?
    a. Restricts cross-domain requests from scripts
    b. Allows all origins
    c. Encrypts data
    d. Controls API rate limiting
    Answer: a. Restricts cross-domain requests from scriptstestdevjobs
36. What is the best way to protect an API against replay attacks?
    a. Use timestamping and nonce values
    b. Disable HTTPS
    c. Allow all traffic
    d. Use only GET requests
    Answer: a. Use timestamping and nonce valuestestdevjobs
37. Why should API responses avoid revealing stack traces or debug info?
    a. To improve formatting
    b. To prevent attackers from gaining insight into system internals
    c. To speed up calls
    d. To comply with HTTP
    Answer: b. To prevent attackers from gaining insight into system internalstestdevjobs
38. What is the impact of insecure direct object references (IDOR)?
    a. Unauthorized access to backend objects/data
    b. Faster API operations
    c. Better encryption
    d. None
    Answer: a. Unauthorized access to backend objects/datawayground+1
39. How can API keys be securely stored?
    a. In public repositories
    b. Secure vaults or environment variables
    c. Hardcoded in client-side JS
    d. In plain text files
    Answer: b. Secure vaults or environment variablesqaautomation+1
40. What is fuzz testing in API security?
    a. Testing APIs under normal conditions
    b. Sending unexpected or random inputs to uncover weaknesses
    c. Encrypting API calls
    d. Disabling API keys
    Answer: b. Sending unexpected or random inputs to uncover weaknessesqaautomation+1
41. Which of these help prevent Man-in-the-Middle (MITM) attacks?
    a. Encryption with TLS/SSL
    b. Plain HTTP
    c. No authentication
    d. Unsecured Wi-Fi
    Answer: a. Encryption with TLS/SSLqaautomation+1
42. What does ‘principle of least privilege’ mean in API security?
    a. Users have access to all resources
    b. Users have minimum access rights necessary
    c. Unlimited API usage
    d. No access controls
    Answer: b. Users have minimum access rights necessarygeeksforgeeks+1
43. How do refresh tokens help API security?
    a. They make tokens last forever
    b. Allow token renewal without re-authentication
    c. Encrypt user passwords
    d. Share credentials
    Answer: b. Allow token renewal without re-authenticationgeeksforgeeks
44. Why is it important to secure API endpoints?
    a. To prevent unauthorized access and data breaches
    b. To speed up the API
    c. To increase user registrations
    d. To log user locations
    Answer: a. To prevent unauthorized access and data breachesqaautomation+1
45. What role does API gateway play in security?
    a. Load balancing only
    b. Acts as a security layer enforcing authentication, routing, rate limiting
    c. Data storage
    d. Encrypting tokens only
    Answer: b. Acts as a security layer enforcing authentication, routing, rate limitingtestdevjobs
46. Why avoid sending sensitive data in URL query parameters?
    a. URLs can be logged and cached insecurely
    b. Speeds up API
    c. Simplifies debugging
    d. Enhances security
    Answer: a. URLs can be logged and cached insecurelyqaautomation
47. How does automated security scanning benefit API inspection?
    a. Finds vulnerabilities early and often
    b. Slows development
    c. Ignores API errors
    d. Saves passwords
    Answer: a. Finds vulnerabilities early and oftengeeksforgeeks
48. What is API schema validation?
    a. Verifying API request and response formats conform to specification
    b. Downloading API docs
    c. Storing user data
    d. None
    Answer: a. Verifying API request and response formats conform to specificationqaautomation
49. What does JWT stand for and its use?
    a. Java Web Token; used for secure authentication tokens
    b. Java Worker Thread
    c. JSON Weak Token
    d. Job Work Time
    Answer: a. Java Web Token; used for secure authentication tokensgeeksforgeeks
50. What practice reduces risk from exposed API credentials?
    a. Use environment variables and rotate keys regularly
    b. Hardcode them
    c. Share on GitHub
    d. Use simple keys
    Answer: a. Use environment variables and rotate keys regularlyqaautomation+1

1. https://qaautomation.expert/2025/01/20/multiple-choice-questions-for-security-testing-on-api-testing/
2. https://testdevjobs.com/interview-help/security-testing-interview-questions-and-answers/
3. https://wayground.com/admin/quiz/66a09647df2e3e1dd8bdaf92/owasp-top-10-api-security-quiz
4. https://www.geeksforgeeks.org/software-testing/api-testing-interview-questions/
5. https://examradar.com/fundamentals-of-api-security-in-web-application-security-mcqs/
6. https://www.igmguru.com/blog/cyber-security-mcqs
7. https://www.saravanansubramanian.com/restapi-quiz/
8. https://itexamanswers.net/3-5-3-quiz-information-gathering-and-vulnerability-scanning-answers.html
9. https://aticleworld.com/rest-api-mcq/
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11. https://testbook.com/objective-questions/mcq-on-owasp-top-10-vulnerabilities–5eea6a0d39140f30f369e30b
12. https://qaautomation.expert/2025/03/04/multiple-choice-questions-for-security-testing-on-web-application/
13. https://www.sanfoundry.com/owasp-questions-answers/
14. https://www.cliffsnotes.com/study-notes/23288515
15. https://testdevjobs.com/interview-help/api-testing-interview-questions-and-answers/
16. https://www.theserverside.com/quiz/REST-web-services-and-RESTful-API-quiz-for-developers
17. https://www.scribd.com/presentation/669898597/API-MCQ-Set1
18. https://www.techtarget.com/searchsecurity/quiz/Quiz-Web-application-threats-and-vulnerabilities
19. https://www.vskills.in/certification/blog/top-50-api-testing-interview-questions-and-answers/
20. https://examradar.com/api-security-and-integration-points-vulnerabilities-mcqs/