Module Quiz: REST APIs :Working with Data in iOS (Meta iOS Developer Professional Certificate) Answers 2026

Question 1

What is the purpose of the URLSession data task in fetching images using Swift?

❌ To represent image files using the UIImage class.
❌ To store image data in memory.
❌ To convert JSON data into Swift objects.
✅ To download and retrieve image data from a server.

Explanation:
URLSessionDataTask ka kaam server se data download karna hota hai — jaise images, JSON, ya text.

Question 2

What is the purpose of JSON in iOS development?

✅ To exchange data between servers and devices in a structured format.
❌ To create user interfaces for mobile apps.
❌ To perform server-side scripting for web applications.
❌ To optimize the performance of mobile apps.

Explanation:
JSON lightweight aur readable format hai jo client–server data exchange ke liye use hota hai.

Question 3

Which of the following best describes the main use case of JSON format?

❌ Storing and retrieving data from an object-oriented database.
✅ Structuring and transmitting data between a server and an application.
❌ Creating graphical user interfaces for mobile applications.

Explanation:
JSON ka main use data transmission hai, na ki UI ya database storage.

Question 4

Which class in Swift is used to manage network data transfer tasks?

❌ URLTask
❌ NetworkSession
✅ URLSession

Explanation:
URLSession networking ke liye central class hai jo data, download, upload tasks manage karti hai.

Question 5

Which of the following statements best describes the functionality of URLSessionTask in Swift?

❌ It is a data structure used for storing URL request information.
❌ It is a class used for parsing JSON data received from a server.
✅ It provides methods for transferring data between a client and a server using a URL session.

Explanation:
URLSessionTask ek abstract task hai jo actual data transfer handle karta hai.

Question 6

Which of the following URLSession methods creates a URLSessionDataTask?

❌ createDataTask
✅ dataTask
❌ newDataTask

Explanation:
URLSession.dataTask(with:) method se hi URLSessionDataTask create hota hai.

Question 7

Which of the following statements about retaining URLSessionTask instances is true?

❌ You must always retain a reference to a URLSessionTask instance.
❌ Retaining a reference can cause memory leaks and should be avoided.
✅ URLSession retains all URLSessionTask instances until they finish by default, so you do not have to retain them yourself.

Explanation:
Task resume() hone ke baad URLSession khud hi task ko retain karta hai jab tak wo complete na ho.

Question 8

What will the output of the following code be?

❌ Task completed
❌ Code will not run due to an error.
✅ Nothing will output to the console.

Explanation:
example.com request ke response ka result background thread me aata hai aur playground / execution context me output guaranteed nahi hota.

Question 9

Can the following JSON String be decoded into the given Swift object as is?

❌ Yes, the full_name key will be automatically available in the Swift object.
✅ No
❌ Yes, but the data will be missing.
❌ Yes

Explanation:
JSON key full_name aur Swift property name match nahi karte. CodingKeys ki zarurat hogi.

Question 10

What is the purpose of the JSONDecoder in Swift?

❌ To send HTTP requests to a server.
❌ To encode Swift objects into JSON format.
✅ To decode JSON data into Swift objects.

Explanation:
JSONDecoder ka use JSON → Swift model conversion ke liye hota hai.

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