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API Testing & Postman – Quiz
Question 1
In which layer of a software architecture is API testing primarily performed?
- A
Presentation Layer
- B
Data Layer
- C
Business Layer
- D
Operating System Layer
Question 2
Which of the following is a key advantage of API testing compared to GUI testing?
- A
It is slower but more reliable
- B
It only validates database operations
- C
It is language-independent and GUI-independent
- D
It depends heavily on the frontend design
Question 3
A tester is validating response codes for an API. Which response should indicate a successful POST request that created a new resource?
- A
200 OK
- B
202 Accepted
- C
204 No Content
- D
201 Created
Question 4
In API testing, which of the following scenarios best requires security testing?
- A
Checking API response time under high load
- B
Ensuring APIs return JSON in the correct format
- C
Testing whether APIs support multiple platforms
- D
Verifying if APIs are protected against SQL Injection
Question 5
You are testing an API that returns book data. When sending a request to /books/123, you get an error “404 Not Found.” What is the most probable reason?
- A
Incorrect HTTP method used
- B
The request body format is invalid
- C
Resource with ID 123 does not exist
- D
API server is down
Question 6
Which of the following is NOT a valid use case of Postman?
- A
Automating API tests using JavaScript
- B
Hosting APIs in production
- C
Generating API documentation
- D
Organizing requests into collections
Question 7
A tester runs a GET API request in Postman and notices ETag in the response header. What does this indicate?
- A
The request is using SSL encryption
- B
A flag showing the request is a cached response
- C
The API server is sending authentication keys
- D
A unique identifier for the resource version
Question 8
In Performance testing of APIs, which metric is the most critical to evaluate?
- A
Response Time
- B
Authentication Methods
- C
API Documentation Quality
- D
GUI Responsiveness
Question 9
During API testing, you encounter a “500 Internal Server Error.” What is the most likely cause?
- A
Invalid request payload
- B
Incorrect HTTP method
- C
Issue in server-side code or configuration
- D
Authentication failure
Question 10
In Postman, why would you use Collections when testing APIs?
- A
To monitor API uptime in production
- B
To encrypt API responses for security
- C
To reduce response size in APIs
- D
To organize related requests and automate workflows
There are 10 questions to complete.