26. In Express, app.use(express.json()) is needed to:
- Send HTML
- Connect to MySQL
- Parse JSON request bodies into req.body
- Start HTTPS
Answer: C) Parse JSON request bodies into req.body
Explanation: The JSON middleware parses incoming JSON.
MCQs / Computer Science / Web Services: Accessing and Creating
Web Services: Accessing and Creating MCQs — Computer Science (page 2)
35 multiple-choice questions on Web Services: Accessing and Creating from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
27. JWT stands for:
- JavaScript Web Transfer
- Joint Web Technology
- JSON Web Token
- Java Web Toolkit
Answer: C) JSON Web Token
Explanation: JWTs are signed JSON tokens used for authentication.
28. "Stateless" in REST means:
- The app has no UI
- Each request contains all information needed; the server stores no client session between requests
- The server has no database
- Responses cannot be cached
Answer: B) Each request contains all information needed; the server stores no client session between requests
Explanation: Statelessness makes REST scalable.
29. Prepared statements in PHP/MySQL protect against:
- SQL injection
- Slow networks
- Battery drain
- Rotation
Answer: A) SQL injection
Explanation: Parameters are sent separately from the SQL command.
30. Checking response.isSuccessful in Retrofit tells you whether the status code is:
- A redirect
- Exactly 404
- Above 500
- In the 200–299 range
Answer: D) In the 200–299 range
Explanation: isSuccessful is true for 2xx codes.
31. The curl option -X POST specifies the:
- Port number
- HTTP method
- Response format
- Header
Answer: B) HTTP method
Explanation: -X sets the request method.
32. SOAP messages are written in:
- YAML
- JSON
- XML
- CSV
Answer: C) XML
Explanation: SOAP uses XML envelopes.
33. The file that describes a SOAP service is called:
- OpenAPI only
- Gradle file
- manifest.json
- WSDL
Answer: D) WSDL
Explanation: Web Services Description Language describes SOAP operations.
34. Which endpoint follows REST naming best practice for listing students?
- GET /api/students
- POST /api/students/list
- GET /getAllStudents
- GET /api/studentlist.php?action=get
Answer: A) GET /api/students
Explanation: Use plural nouns for resources and HTTP methods for actions.
35. Which component in a server receives a request and passes it to business logic?
- Route / controller
- ViewHolder
- Layout
- Content provider
Answer: A) Route / controller
Explanation: Routes/controllers map URLs to handler code.
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