1. Which method and status code are typical for successfully creating a resource?
- PUT, 404
- DELETE, 204
- POST, 201 Created
- GET, 200
Answer: C) POST, 201 Created
Explanation: Creation with POST returns 201.
MCQs / Computer Science / Web Services: Accessing and Creating
Web Services: Accessing and Creating MCQs — Computer Science
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.
2. A permanent two-way connection used for live chat is provided by:
- WebSockets
- WSDL
- REST polling only
- SharedPreferences
Answer: A) WebSockets
Explanation: WebSockets keep an open bidirectional connection.
3. Which free fake API is used in this course to practise GET requests?
- maps.google.com
- JSONPlaceholder
- localhost:8080
- api.android.com
Answer: B) JSONPlaceholder
Explanation: jsonplaceholder.typicode.com returns sample JSON.
4. REST stands for:
- REpresentational State Transfer
- Resource Entry State Table
- Reliable Encrypted Socket Transfer
- Remote Execution Service Technology
Answer: A) REpresentational State Transfer
Explanation: REST was defined by Roy Fielding in 2000.
5. /api/v1/students includes v1 to support:
- API versioning
- Pagination
- Encryption
- Authentication
Answer: A) API versioning
Explanation: Versioning allows changes without breaking old apps.
6. Which HTTP method is NOT idempotent?
- POST
- PUT
- GET
- DELETE
Answer: A) POST
Explanation: Repeating POST may create duplicates.
7. From the Android emulator, the developer computer's localhost is reached at:
- 10.0.2.2
- 192.168.0.1
- 0.0.0.0
- 127.0.0.1
Answer: A) 10.0.2.2
Explanation: 10.0.2.2 is the emulator's alias for the host loopback interface.
8. On Android, tokens should be encrypted using the:
- strings.xml file
- Android Keystore system
- res/raw folder
- Logcat
Answer: B) Android Keystore system
Explanation: The Keystore protects cryptographic keys.
9. A token sent with each request in the header usually looks like:
- Host: token
- Cookie: password=1234
- Content-Type: token
- Authorization: Bearer eyJhbGciOi...
Answer: D) Authorization: Bearer eyJhbGciOi...
Explanation: Bearer tokens (often JWT) authenticate API requests.
10. OpenAPI (Swagger) is used to:
- Encrypt APIs
- Document APIs and provide interactive testing pages
- Compile Kotlin
- Host databases
Answer: B) Document APIs and provide interactive testing pages
Explanation: OpenAPI describes endpoints, parameters and responses.
11. A successful DELETE that returns no body usually responds with:
- 500
- 301
- 204 No Content
- 200 with HTML
Answer: C) 204 No Content
Explanation: 204 indicates success without content.
12. Which tool is widely used to test API endpoints by sending requests manually?
- Logcat
- Postman
- Figma
- Gradle
Answer: B) Postman
Explanation: Postman sends HTTP requests and shows responses.
13. REST is best described as a:
- Database
- Programming language
- Architectural style
- Protocol
Answer: C) Architectural style
Explanation: REST is a set of architectural constraints, not a protocol.
14. A web service is mainly designed for:
- Machine-to-machine communication over a network
- Drawing layouts
- Storing preferences on the phone
- Designing app icons
Answer: A) Machine-to-machine communication over a network
Explanation: Web services let programs exchange data over the web.
15. Before an API is used by a real app it should be deployed with:
- HTTP only
- No domain
- HTTPS on a public server or cloud platform
- A WSDL file only
Answer: C) HTTPS on a public server or cloud platform
Explanation: Production APIs must be reachable over HTTPS.
16. Firebase and Supabase are examples of:
- IDEs
- Backend-as-a-Service (BaaS) platforms
- Mobile operating systems
- Programming languages
Answer: B) Backend-as-a-Service (BaaS) platforms
Explanation: BaaS platforms provide databases, auth and APIs without writing a full server.
17. Which API technology lets the client request exactly the fields it needs?
- FTP
- SMTP
- SOAP
- GraphQL
Answer: D) GraphQL
Explanation: GraphQL queries specify the required fields.
18. Which of these is a popular JavaScript framework for building REST APIs?
- Jetpack Compose
- Express (Node.js)
- Retrofit
- Room
Answer: B) Express (Node.js)
Explanation: Express runs on Node.js to build web servers and APIs.
19. Which Python framework is commonly used to build REST APIs?
- ASP.NET
- Spring Boot
- Django REST Framework / FastAPI / Flask
- Laravel
Answer: C) Django REST Framework / FastAPI / Flask
Explanation: Python has several API frameworks.
20. Why should secret API keys not be stored inside the APK?
- Google Play rejects all strings
- Keys slow down the app
- APKs cannot hold strings
- APKs can be decompiled and the keys extracted
Answer: D) APKs can be decompiled and the keys extracted
Explanation: Secrets in the client are not secure; keep them on the server.
21. "Sign in with Google" is based on which standard?
- FTP
- SMTP
- SOAP
- OAuth 2.0 / OpenID Connect
Answer: D) OAuth 2.0 / OpenID Connect
Explanation: OAuth 2.0 and OpenID Connect handle delegated authentication.
22. In res.status(201).json(item), 201 tells the client that:
- The resource was deleted
- Authentication is needed
- A new resource was created
- The request failed
Answer: C) A new resource was created
Explanation: 201 Created confirms creation.
23. Which is TRUE about REST compared with SOAP?
- REST cannot use HTTP
- REST needs WSDL
- REST only uses XML
- REST is lighter, usually uses JSON and is better suited to mobile apps
Answer: D) REST is lighter, usually uses JSON and is better suited to mobile apps
Explanation: REST's lightweight JSON messages suit mobile networks.
24. Which OkHttp feature can add an Authorization header to every request automatically?
- Interceptor
- Converter
- Dispatcher
- Adapter
Answer: A) Interceptor
Explanation: Interceptors modify requests and responses.
25. GET /api/students?semester=5&page=2 uses query parameters for:
- Creating a record
- Deleting records
- Authentication
- Filtering and pagination
Answer: D) Filtering and pagination
Explanation: Query strings filter and paginate lists.
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