Tough Objective C Test - 93+ MCQs: Objective-C test: Evaluate Your Proficiency with Challenging Objective-C Questions and Answers

1. What is the purpose of the '__unsafe_unretained' specifier in Objective-C?

Indicates an unsafe variable

Denotes an unretained property

Thread synchronization

Specifying a memory block

2. Which keyword is used to declare a method in Objective-C?

@method

@function

@selector

@interface

3. What is the purpose of the 'unowned' keyword in Objective-C ARC (Automatic Reference Counting)?

Indicates a weak reference

Denotes an unowned property

Specifies an unsafe reference

Used for pointer arithmetic

4. What is the purpose of the 'NSFileManager' class in Objective-C?

File creation

File management operations

File formatting

File compression

5. What is the purpose of the 'SEL' data type in Objective-C?

Select Element

Static Element Locator

Selector

Special Element Language

6. How do you implement property observers in Objective-C?

Using didSet and willSet

Using @propertyObserver

By overriding getters and setters

Using propertyObservers keyword

7. Explain the role of 'dispatch_data' in Objective-C GCD.

Data encryption

Creating custom exceptions

Managing data buffers

Thread synchronization

8. What is the purpose of the 'NSRunLoopCommonModes' in Objective-C?

User interface design

Thread synchronization

Run loop modes

Exception handling

9. What is the primary design philosophy of Objective-C?

Procedural Programming

Object-Oriented Programming

Functional Programming

Imperative Programming

10. Which Objective-C framework is used for parsing JSON data?

CoreData

Foundation

UIKit

CoreGraphics

Objective-C MCQ Test 5