Final Graded Quiz: Working with Data in iOS :Working with Data in iOS (Meta iOS Developer Professional Certificate) Answers 2026

Question 1

What modifier should you use in a View to run a code asynchronously to query a REST API?

❌ onAppear
❌ viewDidAppear
✅ task

Explanation:
SwiftUI me .task {} async operations (API calls) ke liye recommended hai.

Question 2

Which of the following is true for Core Data?

❌ Entities and contexts are the same things.
✅ Entities and their relationships are the core of Core Data.
❌ Relationships have properties like names and prices.

Explanation:
Attributes store data, relationships sirf links banate hain.

Question 3

Populate Dessert entity properties?

❌ price as String
✅ price as Double/Int value
❌ Key-value subscripting

Correct Answer:

Explanation:
Core Data attributes direct assign hote hain, dictionary style nahi.

Question 4 (Select all that apply)

True statements?

✅ A Dish can hold information about multiple customers but a Customer can only hold information about one dish.
❌ Customer holds many dishes
✅ consumedBy expects a set of customers

Explanation:
One-to-many relationship = Set<Customer>.

Question 5

Class that groups HTTP requests?

❌ NSRequests
✅ URLSession
❌ URLSessionTask

Question 6

Which is true for @FetchRequest?

❌ Retrieves relationships
❌ Default creation order
✅ Used to retrieve data from Core Data

Question 7

Compound predicates are used for?

❌ Math
❌ Sorting
✅ Complex filtering

Question 8 (Select all that apply)

True for sort predicates?

❌ Sorting across entities
✅ Single or multiple parameters of same entity
❌ Treat foreign characters like regular ones

Question 9

Filtering & sorting Core Data?

✅ Sorting and filtering can happen simultaneously
❌ Must sort first
❌ Must filter first

Question 10 (Select all that apply)

Valid predicates?

✅ Option 1 (NSCompoundPredicate OR)
✅ Option 2 (NSPredicate OR)
❌ Option 3 (AND instead of OR)

Question 11

HTTP method to retrieve data?

❌ POST
✅ GET
❌ PUT
❌ DELETE

Question 12

Correct API route naming?

❌ /api/user/12345/getUserInfo
❌ /api/fetch_user
❌ /api/getUsersData
✅ /api/users

Question 13

Advantage of token-based authentication?

❌ Easier to implement
❌ Unlimited calls
✅ More secure
❌ Works with all languages

Question 14

Main difference auth vs authorization?

❌ Physical vs virtual
❌ Who vs what (reversed)
✅ Authentication once, authorization per action
❌ Password vs token

Question 15

First stage in API lifecycle?

❌ Processing
❌ Authentication
✅ Request stage

Question 16

What is FetchRequest?

❌ Array sorting
❌ UI connector
❌ Persistence store
✅ Property wrapper that retrieves Core Data entries

Question 17

RESTful API requirement?

❌ SOAP
✅ Stateless architecture
❌ Server-side
❌ Require auth

Question 18

True about POST?

✅ Comes with request body (payload) & creates resource
❌ URL params only
❌ XML only
❌ Multiple resources best practice

Question 19

HTTP code for wrong username/password?

❌ 403
✅ 401
❌ 200

Question 20

DELETE on collection endpoint?

❌ Delete one
❌ Delete entire collection
✅ Delete only specific resource (/id)
❌ Delete all via /id

Question 21

What is URLSession?

❌ Simple HTTPS
❌ Simple HTTP
❌ Complex HTTP
✅ Everything needed for complex HTTPS networking

Question 22

Swift JSON model vs JSON data?

❌ Must match exactly
✅ Can have fewer properties; missing ignored
❌ Must have more properties

Question 23

Purpose of PersistenceController?

❌ UI
❌ View hierarchy
❌ Networking
✅ Manage Core Data persistent store

Question 24

Purpose of NSSortDescriptor?

❌ Data format
✅ Specify sort order & criteria
❌ Define relationships

Question 25

HTTP 403 means?

❌ Authentic source
❌ Wrong password
❌ Not authentic
✅ Authenticated but not authorized

Question 26

Recommended noun usage in REST API?

❌ Singular
❌ Non-resource nouns
✅ Plural nouns
❌ Arbitrary names

Question 27

What is Hashable?

❌ ML framework
✅ Protocol for efficient Set/Dictionary storage
❌ Networking class
❌ Media library

Question 28

Menu item data format?

❌ Plain text
❌ XML
❌ CSV
✅ JSON array of objects

Question 29

Redirection HTTP codes?

✅ 300–399
❌ 400–499
❌ 200–299
❌ 500–599

Question 30

Purpose of API versioning?

❌ Rate limiting
❌ Sorting/filtering
✅ Protect clients from breaking changes
❌ Caching DB calls

🧾 Summary Table