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Basic Cocoa Programming for Mac OS X MCQ

1. Which of the following is a valid Uniform Type Identifier?

JPEG

.jpg

public.jpeg

image/jpeg

.jpeg

Answer

Correct Answer: public.jpeg

Note: This Question is unanswered, help us to find answer for this one

2.
Is the following code correct?

NSMutableArray *a = [NSMutableArray new];

// do something with a

[a release];

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

3.
Is the following code correct?

NSMutableArray *a = [[NSMutableArray new] autorelease];

// do something with a

[a release];

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

4.
Is the following code correct?

NSMutableArray *a = [NSMutableArray array];

// do something with a

[a release];

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

5.
If you call interpretKeyEvents:, which of the following method is likely to be called?

collectEvent:

dispatchEvent

sendEvent

insertText

None of the above

Answer

Correct Answer: insertText

Note: This Question is unanswered, help us to find answer for this one

6.
What will be the output of the following code?

NSRect rect = NSMakeRect(0, 0, 10, 10);
NSRect rect2 = malloc(sizeof(rect2));
if(!rect2) {
NSLog(@"Not enough memory.");
exit(EXIT_FAILURE);
}

*rect2 = rect;

printf("%d\n", rect.size.width);

RUNTIME ERROR

COMPILATION ERROR

None of the above

Answer

Correct Answer: 0

Note: This Question is unanswered, help us to find answer for this one

7.
Is NSRunLoop thread safe?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

8.
Can an object marked for autorelease be retained?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

9.
Fill the blank
NSView : <> : NSObject

NSWindow

NSResponder

NSResponder : NSWindow

NSRootView

NSRoot

Answer

Correct Answer: NSResponder

Note: This Question is unanswered, help us to find answer for this one

10.
Can you use NSLock on a POSIX mutex?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

11.
What kind of memory management mechanisms can Cocoa uses?

Garbage collection

Reference counting

Manual memory management

None of the above

Answer

Correct Answer: Garbage collection
Reference counting
Manual memory management

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

12.
Which of the following retrieves the application main bundle?

[NSBundle mainBundle]

[NSApplication mainBundle]

[NSApp mainBundle]

None of the above

Answer

Correct Answer: [NSBundle mainBundle]

Note: This Question is unanswered, help us to find answer for this one

13.
Is it possible to create events and dispatch them to the application?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

14.
What is Cocoa?

A language

A tree

A system

A framework

None of the above

Answer

Correct Answer: A framework

Note: This Question is unanswered, help us to find answer for this one

15.
Is the following code correct?
- (void)myMethod:(NSString **)s {
*s = [[NSString alloc] init];
}

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

16.
What is true regarding notifications?

They can be dispatched to only one object

The object posting the notification does not even have to know whether the observer exists

An object may receive any message you like from the notification center, not just the predefined delegate method

All of the above

None of the above

Answer

Correct Answer: The object posting the notification does not even have to know whether the observer exists
An object may receive any message you like from the notification center, not just the predefined delegate method

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

17.
What threading API should be used in Cocoa?

CFThread

pthread

pth

NSThread

None of the above

Answer

Correct Answer: NSThread

Note: This Question is unanswered, help us to find answer for this one

18.
Is the following code valid?
NSRect r;
r.size = NSMakeSize(10,10);
r.origin = NSMakePoint(-5, -5);

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

19.
Where is the (0,0) coordinate located on the screen?

top-left

top-right

bottom-left

bottom-right

center

Answer

Correct Answer: top-left

Note: This Question is unanswered, help us to find answer for this one

20.
Can NSBundle be used to load Java code?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

21.
Fill the blank.
NSNotification : <> : NSObject

NSEvent

NSCenter

NSDistributed

NSGeneralNotification

Nothing is required to fill the blank

Answer

Correct Answer: Nothing is required to fill the blank

Note: This Question is unanswered, help us to find answer for this one

22.
Is there a double click event?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

23.
What is a toll-free bridged class?

A superclass of another class

A class that can be interchanged with another class bycasting

A wrapper around another class

A class with no memory need.

None of the above.

Answer

Correct Answer: A class that can be interchanged with another class bycasting

Note: This Question is unanswered, help us to find answer for this one

24.
Can resources be localized?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

25.
How can you move a view?

You cannot

By calling move: method

By changing the frame with setFrame:

None of the above

Answer

Correct Answer: By changing the frame with setFrame:

Note: This Question is unanswered, help us to find answer for this one

26.
Why is CGFloat recommenced to be used instead of float?

They are the same; so it’s done only to make the code look nicer.

CGFloat is a special structure used to do arbitrary number computation.

For 64bit compatibility

None of the above

Answer

Correct Answer: For 64bit compatibility

Note: This Question is unanswered, help us to find answer for this one

27.
Which of the following creates an autoreleased array?

[NSMutableArray array];

[NSMutableArray new];

[[NSMutableArray alloc] init];

Answer

Correct Answer: [NSMutableArray array];

Note: This Question is unanswered, help us to find answer for this one

28.
What is NSViewHeightSizable constant used for?

Transparency

Scrolling

Autoresizing

Magnification

None of the above

Answer

Correct Answer: Autoresizing

Note: This Question is unanswered, help us to find answer for this one

29.
Can POSIX thread be used in Cocoa?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

30.
Is it correct to have sibling views overlapping?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

31.
What method should be called before you are able to draw in the drawRect: method of a view?

None

lockFocus

lockView

prepareDrawing

None of the above

Answer

Correct Answer: None

Note: This Question is unanswered, help us to find answer for this one

32.
Can a notified object find out from where the notification is coming? (Sending Object)

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

33.
In a typical Cocoa application, do you have to manage your runloop yourself?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

34.
Does Cocoa support 64bits?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

35.
What is a notification?

A user event

A special message type used within the kernel

An object that encapsulates information about an event

None of the above

Answer

Correct Answer: An object that encapsulates information about an event

Note: This Question is unanswered, help us to find answer for this one

36.
Is the following code valid?
NSSize s = NSMakeSize(10, 10);
int values[20];
values[s.height] = 5;

Compile error

Runtime error

Valid code

Answer

Correct Answer: Compile error

Note: This Question is unanswered, help us to find answer for this one

37.
Can you detach threads in Cocoa?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

38.
Can NSDistributedNotificationCenter be used to communicate between multiple machines?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

39.
Which of the following classes manages the computer’s global notifications?

NSNotificationCenter

NSDistributedNotificationCenter

NSGlobalNotificationCenter

NSSystemNotificationCenter

Answer

Correct Answer: NSDistributedNotificationCenter

Note: This Question is unanswered, help us to find answer for this one

40.
Fill the blank
NSMutableArray : <> : NSObject

NSSet

NSCollection

NSArray

NSContainer

NSMovableArray

Answer

Correct Answer: NSArray

Note: This Question is unanswered, help us to find answer for this one

41.
What method should be called before you are able to draw outside the drawRect: method of a view?

None

lockView

lockFocus

prepareView

None of the above

Answer

Correct Answer: lockFocus

Note: This Question is unanswered, help us to find answer for this one

42.
If you spawn a thread with POSIX thread api, will Cocoa be notified?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

43.
What is NSRect?

A class

An object

A structure

A C built in type

An Objective-C built in type

Answer

Correct Answer: A structure

Note: This Question is unanswered, help us to find answer for this one

44.
Fill the blank.
NSCountedSet : <> : NSObject

NSArray : NSClass

NSMutableArray : NSArray

NSMutableSet : NSSet

NSSet

NSSet : NSArray

Answer

Correct Answer: NSMutableSet : NSSet

Note: This Question is unanswered, help us to find answer for this one

45.
How is a GUI usually created in Cocoa?

With interface builder

By editing xml files manually

Programmatically

None of the above

Answer

Correct Answer: With interface builder

Note: This Question is unanswered, help us to find answer for this one

46.
What is the normal way of handling cocoa events?

By polling for events

By registering an event watcher

By implementing NSResponder methods in subclasses

None of the above

Answer

Correct Answer: By implementing NSResponder methods in subclasses

Note: This Question is unanswered, help us to find answer for this one

47.
Where should application resources be usually put?

In /System

In /Library

Within the application’s bundle

In /Resources

None of the above

Answer

Correct Answer: Within the application’s bundle

Note: This Question is unanswered, help us to find answer for this one

48.
Which of the following platforms supports Cocoa?

Windows

Linux

Mac OSX

Solaris

None of the above

Answer

Correct Answer: Mac OSX

Note: This Question is unanswered, help us to find answer for this one

49.
Can an object be the delegate of multiple objects?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

50.
How wide is unichar on a 32bit machine?

8bit

16bit

32bit

64bit

128bit

Answer

Correct Answer: 16bit

Note: This Question is unanswered, help us to find answer for this one

51.
Can you use malloc/free in a Cocoa application?

Yes

Yes, but only in a separate C library

Yes, but we can use only malloc; free is not needed

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

52.
Fill the blank.
NSButton : <> : NSObject

NSControl:

NSWidget : NSView : NSResponder

NSResponder

NSWidget

NSControl : NSView : NSResponder

Answer

Correct Answer: NSControl : NSView : NSResponder

Note: This Question is unanswered, help us to find answer for this one

53.
What is an observer?

An object that implements the NSObserver protocol

An object that sends a notification

An object that receives All notifications

An object registered with the notification center

None of the above

Answer

Correct Answer: An object registered with the notification center

Note: This Question is unanswered, help us to find answer for this one

54.
Can poll() be used to fetch Cocoa events?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

55.
What class should be used to load resources?

NSResource

NSApplication

NSBundle

NSFile

None of the above

Answer

Correct Answer: NSBundle

Note: This Question is unanswered, help us to find answer for this one

56.
Is it mandatory to create an NSAutoreleasePool in a Cocoa application?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

57.
Is NSString mutable?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

58.
In which language is Cocoa written?

Objective-C

C++

Java

Ruby

Answer

Correct Answer: Objective-C

Note: This Question is unanswered, help us to find answer for this one

59.
Under Mac OS X 10.5, CGRect, CGSize and CGPoint have the same structure as NSRect, NSSize and
NSPoint respectively. Is it true?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

60. The ________ object is the application's main controlling object.

NSWindow

NSDocument

NSApp

NSApplication

Answer

Correct Answer: NSApp

Note: This Question is unanswered, help us to find answer for this one

61. A ______ object sends a message automatically to a target when an on-screen object is manipulated.

responder

selector

nib

control

Answer

Correct Answer: control

Note: This Question is unanswered, help us to find answer for this one

62. Which does not belong in web infrastructure:

Database

Web server

Smartphone

Mainframe

Answer

Correct Answer: Mainframe

Note: This Question is unanswered, help us to find answer for this one

63. Which one is not a Navigator in Xcode?

Project Navigator

Symbol Navigator

Issue Navigator

Assistant Navigator

Answer

Correct Answer: Assistant Navigator

Note: This Question is unanswered, help us to find answer for this one

64. ________ are NOT a Cocoa event.

Repeating events

Mouse events

Periodic events

Keyboard events

Answer

Correct Answer: Repeating events

Note: This Question is unanswered, help us to find answer for this one

65. What does the Interface Builder in Xcode do?

Reuse of the Button object, but need to code it each time you need it.

Create the View class manually

It cannot create views

Code reuse of the views classes

Answer

Correct Answer: Code reuse of the views classes

Note: This Question is unanswered, help us to find answer for this one

66. The Mac OS X _______ replaces the Mac OS 9 Application menu.

Document Window

Menu Bar

Dock

Controls

Answer

Correct Answer: Dock

Note: This Question is unanswered, help us to find answer for this one

67. _______ is not a subclass of NSResponder.

NSView

NSApplication

NSEvent

NSWindow

Answer

Correct Answer: NSEvent

Note: This Question is unanswered, help us to find answer for this one

68. The ______ is a section of code that reads events and performs appropriate functions for those events.

event loop

main nib

NSEvent

NSResponder

Answer

Correct Answer: event loop

Note: This Question is unanswered, help us to find answer for this one

69. The ________ is a framework that contains all the objects needed to implement a graphical event-driven user interface.

Foundation Kit

Core Functions

Application Kit

Core Data

Answer

Correct Answer: Application Kit

Note: This Question is unanswered, help us to find answer for this one

70. The Mac OS X graphical user interface (GUI) is called _________.

iOS

Cocoa

Aqua

Objective-C

Answer

Correct Answer: Aqua

Note: This Question is unanswered, help us to find answer for this one

71. True or False? NSNumber objects cannot be changed after initialization.

False

True

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

72. NSDocument class is used for ______.

saving the contents of a window into a file

printing the contents of a window

loading a saved file

alerting a user who tries to close an edited window without first saving

Answer

Correct Answer: saving the contents of a window into a file

Note: This Question is unanswered, help us to find answer for this one

73. A Cocoa ______ is a message and a corresponding object sent to an application in response to some action taken by the user.

selector

event

nib

class

Answer

Correct Answer: event

Note: This Question is unanswered, help us to find answer for this one

74. True or False? Memory management is completely automatic.

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

75. ______ is NOT a type of Mac OS X on-screen window.

Dialog

Utility Window

Cursor Window

Document Window

Answer

Correct Answer: Cursor Window

Note: This Question is unanswered, help us to find answer for this one

76. In Xcode, what does the Identity Inspector do?

Inspects your code for errors

None of the Above

Set the properties of an object

Find the identity of the programmer

Answer

Correct Answer: Set the properties of an object

Note: This Question is unanswered, help us to find answer for this one

77. _______ class allows you to journal events in your application.

NSLog

NSDocument

NSApplication

NSResponder

Answer

Correct Answer: NSLog

Note: This Question is unanswered, help us to find answer for this one

78. _______ is the object persistence framework included with Foundation Kit.

Core Data

Application Kit

Interface Builder

Project Builder

Answer

Correct Answer: Core Data

Note: This Question is unanswered, help us to find answer for this one

79. ______ is Apple's computing infrastructure that consists of Mach, Unix services, and Mac OS X networking and filesystems.

Cocoa

Darwin

Aqua

Interface Builder

Answer

Correct Answer: Darwin

Note: This Question is unanswered, help us to find answer for this one

80. ______ class will implement a mutex.

NSCell

NSLock

NSResponder

NSApplication

Answer

Correct Answer: NSLock

Note: This Question is unanswered, help us to find answer for this one

81. Which control can the user add a small piece of data?

UITextField

View Controller

Label

Button

Answer

Correct Answer: UITextField

Note: This Question is unanswered, help us to find answer for this one

82. In the XCode window, the _____ lists files, search results, and build settings.

File View

Interface Builder

Project View

Document Window

Answer

Correct Answer: Project View

Note: This Question is unanswered, help us to find answer for this one

83. True or False? Objective-C is a static typed language.

False

True

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

84. In the Interface Builder, the _______ contains stock items in Cocoa that you can drag-and-drop into your application.

Document Window

Application Window

Menu Bar

Library Palette

Answer

Correct Answer: Library Palette

Note: This Question is unanswered, help us to find answer for this one

85. Which control wold you want to use as a data source?

label

Button

View Controller

UITableView

Answer

Correct Answer: UITableView

Note: This Question is unanswered, help us to find answer for this one

86. True or False? Objective-C does not have a constructor or destructor.

False

True

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

87. Objective-C uses the concept of ______ which allows modifications to an existing class in-place.

class copying

88. In Objective-C, methods are represented by a ______ which is a string describing the method to call.

selector

object

cursor

89. What does GCD stand for?

Grand Control Display

Grand Central Dispatch

Great Central Dispatcher

General Code Destroyer

Answer

Correct Answer: Grand Central Dispatch

Note: This Question is unanswered, help us to find answer for this one

90. True or False? Cocoa allows you to move objects in the main nib to other separate nibs to improve load performance.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

91. The most commonly used debugger used with Cocoa is ______.

Mac OS X

Visual Studio debugger

GDB

Aqua

Answer

Correct Answer: GDB

Note: This Question is unanswered, help us to find answer for this one

92. A property:

A list of variables

A point in time

sets getter/setter methods

a characteristic

Answer

Correct Answer: sets getter/setter methods

Note: This Question is unanswered, help us to find answer for this one

93. What are atomic and nonatomic associated with?

Mac Lion

iPhone 3

Exception handling

Multithreading

Answer

Correct Answer: Multithreading

Note: This Question is unanswered, help us to find answer for this one

94. True or False? A Cocoa program may not be compiled from a command-line prompt.

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

95. The "NS" in NSObject stands for:

Next Step

Nasa Studios

Nothing Short

Name Steve

Answer

Correct Answer: Next Step

Note: This Question is unanswered, help us to find answer for this one

96. True or False? Objective-C classes are objects.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

97. Imutable objects can't be__:

started

moved

disposed

changed

Answer

Correct Answer: changed

Note: This Question is unanswered, help us to find answer for this one

98. A _________ file stores all information about an application's user interface objects.

class

nib

99. Whenever you customize an existing class, it is called:

Programming

Disposing

Architecting

subclassing

Answer

Correct Answer: subclassing

Note: This Question is unanswered, help us to find answer for this one

100. What does the term "nil" mean in reference to a variable?

"nil" is only used inreference to exception management

No object is in reference to the variable

It doesn't affect the value of a variable at all.

"nil" is incorrect it should be dispose

Answer

Correct Answer: No object is in reference to the variable

Note: This Question is unanswered, help us to find answer for this one

101. True or False? NSDictionary objects can be changed after initialization.

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

102. OOP stands for Object Oriented Programming. It is used for:

Its an installer to download XCode from the internet and build on your Mac

Code reuse

In Xcode its called the Simulator which allows you to test your mobile apps in a virtual environment

It will send your completed app project to the App Store.

Answer

Correct Answer: Code reuse

Note: This Question is unanswered, help us to find answer for this one

103. The ________ is a framework that defines a base layer of Objective-C classes.

Application Kit

Foundation Kit

Core Data

Aqua

Answer

Correct Answer: Foundation Kit

Note: This Question is unanswered, help us to find answer for this one

104. Application ______ are stored in a file with a .icns extension.

includes

icons

headers

nibs

Answer

Correct Answer: icons

Note: This Question is unanswered, help us to find answer for this one

105. Which objects are NOT part of Cocoa framework?

NSMutableDictionary

NSSting

NSApple

NSPoint

Answer

Correct Answer: NSApple

Note: This Question is unanswered, help us to find answer for this one

106. Which one is NOT a UI control in Xcode?

ASP Textbox

View Controller

Page View Controller

Label

Answer

Correct Answer: ASP Textbox

Note: This Question is unanswered, help us to find answer for this one

107. ________ is used to create application interfaces and make connections between interface objects.

Aqua

XCode

Dock

Interface Builder

Answer

Correct Answer: Interface Builder

Note: This Question is unanswered, help us to find answer for this one

108. Which objects do NOT exist in the Cocoa framework?

NSString

NSMutableDictionary

NSRedman

NSLog

Answer

Correct Answer: NSRedman

Note: This Question is unanswered, help us to find answer for this one

109. Which Cocoa class is used to create a string?

MSLog

NSString

MSString

NSLog

Answer

Correct Answer: NSString

Note: This Question is unanswered, help us to find answer for this one

110. What does a debugger do?

It is used to create UIViews in Xcode

Helps finds errors in your code.

It sets up your iOS environment

It is used to troubleshoot OS problems with iPad

Answer

Correct Answer: Helps finds errors in your code.

Note: This Question is unanswered, help us to find answer for this one

111. What framework(s) make up Cocoa?

System.Web

AppKit and Foundation

Spring

MVC

Answer

Correct Answer: AppKit and Foundation

Note: This Question is unanswered, help us to find answer for this one

112. The Cocoa Framework is OOP. Why is that helpful?

Its not worth the time to learn

Everytime you want to uses code that someone has written, you have to rewrite every line

OOP allows the coder to reuse and customize existing objects into their new code.

You cannot reuse code once it exists

Answer

Correct Answer: OOP allows the coder to reuse and customize existing objects into their new code.

Note: This Question is unanswered, help us to find answer for this one

113. True or False? Cocoa uses the Model-View-Controller (MVC) design pattern.

False

True

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

114. There is only one computer you can code IOS on. Which is it?

ASUS

Mac

Xbox360

Dell

Answer

Correct Answer: Mac

Note: This Question is unanswered, help us to find answer for this one

115. The Cocoa API for iOS is called?

Chocolate Cake

Cocoa Touch

Cocoa Gesture

JellyBean

Answer

Correct Answer: Cocoa Touch

Note: This Question is unanswered, help us to find answer for this one

116. What IDE does iOS use?

Xcode

Visual Studio

Eclipse

Apple

Answer

Correct Answer: Xcode

Note: This Question is unanswered, help us to find answer for this one

117. Which extension file is NOT in use in Xcode?

Possession.xib

Possesion.aspx

Possesion.m

Possession.h

Answer

Correct Answer: Possesion.aspx

Note: This Question is unanswered, help us to find answer for this one

118. _______ provides Cocoa as its object-oriented appliciation programming interface (API).

Apple

Sun

Oracle

Microsoft

Answer

Correct Answer: Apple

Note: This Question is unanswered, help us to find answer for this one

119. All of Cocoa's built in classes start with:

postive attitude

A letter

Answer

Correct Answer: NS

Note: This Question is unanswered, help us to find answer for this one

120. True or False? The two most important Mac OS X developer tools are XCode (formerly Project Builder) and Interface Builder.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

121. What is the proper statement?

label.text = @"Hello World",

label.text = @"Hello World";

label.text = &"Hello World";

label.text = @"Hello World":

Answer

Correct Answer: label.text = @"Hello World";

Note: This Question is unanswered, help us to find answer for this one

122. Which objects DO exist in the Cocoa framework?

NSLog

MSLog

LSLog

KSLog

Answer

Correct Answer: NSLog

Note: This Question is unanswered, help us to find answer for this one

123. Does the current iOS version support multitasking?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

124. Which language are iOS apps coded in?

C++

Objective-C

C#.Net

J2EE

Answer

Correct Answer: Objective-C

Note: This Question is unanswered, help us to find answer for this one

125. Before you can begin,you must download and install the ____.

Microsoft Word

ZIP FILE

iOS SDK

Windows OS

Answer

Correct Answer: iOS SDK

Note: This Question is unanswered, help us to find answer for this one

126. Which statement is correct:

NSColor* houseColor = [housePaintObj color].

NSColor* houseColor = [housePaintObj color]]

NSColor* houseColor = [housePaintObj color]\

NSColor* houseColor = [housePaintObj color];

Answer

Correct Answer: NSColor* houseColor = [housePaintObj color];

Note: This Question is unanswered, help us to find answer for this one

127. Which is the correct statement:

#import <UIKit/UIKit.h>

&import <UIKit/UIKit.h

()import <UIKit/UIKit.h>

$import <UIKit/UIKit.h>

Answer

Correct Answer: #import <UIKit/UIKit.h>

Note: This Question is unanswered, help us to find answer for this one

128. ______ is the root class for most classes in the Objective-C class hierarchy.

NSLog

NSResponder

NSEvent

NSObject

Answer

Correct Answer: NSObject

Note: This Question is unanswered, help us to find answer for this one

129. _______ is Cocoa's integrated development environment (IDE).

Interface Builder

Dock

Aqua

XCode

Answer

Correct Answer: XCode

Note: This Question is unanswered, help us to find answer for this one

130. What is protocol?

Used in Java

Part of classes interface

A list of variables

Not used

Answer

Correct Answer: Part of classes interface

Note: This Question is unanswered, help us to find answer for this one

131. A ________ is a list of information read by applications while they are launching.

method

property list

function

class

Answer

Correct Answer: property list

Note: This Question is unanswered, help us to find answer for this one

132. __________ is NOT one of the Cocoa Objective-C object libraries.

Core Data

Touch Kit

Foundation Kit

Application Kit

Answer

Correct Answer: Touch Kit

Note: This Question is unanswered, help us to find answer for this one

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Basic Cocoa Programming for Mac OS X MCQ

1. Which of the following is a valid Uniform Type Identifier?

2. Is the following code correct? NSMutableArray *a = [NSMutableArray new]; // do something with a [a release];

3. Is the following code correct? NSMutableArray *a = [[NSMutableArray new] autorelease]; // do something with a [a release];

4. Is the following code correct? NSMutableArray *a = [NSMutableArray array]; // do something with a [a release];

5. If you call interpretKeyEvents:, which of the following method is likely to be called?

6. What will be the output of the following code? NSRect rect = NSMakeRect(0, 0, 10, 10); NSRect *rect2 = malloc(sizeof(*rect2)); if(!rect2) { NSLog(@"Not enough memory."); exit(EXIT_FAILURE); } *rect2 = rect; printf("%d\n", rect.size.width);

7. Is NSRunLoop thread safe?

8. Can an object marked for autorelease be retained?

9. Fill the blank NSView : <> : NSObject

10. Can you use NSLock on a POSIX mutex?

11. What kind of memory management mechanisms can Cocoa uses?

12. Which of the following retrieves the application main bundle?

13. Is it possible to create events and dispatch them to the application?

14. What is Cocoa?

15. Is the following code correct? - (void)myMethod:(NSString **)s { *s = [[NSString alloc] init]; }

16. What is true regarding notifications?

17. What threading API should be used in Cocoa?

18. Is the following code valid? NSRect r; r.size = NSMakeSize(10,10); r.origin = NSMakePoint(-5, -5);

19. Where is the (0,0) coordinate located on the screen?

20. Can NSBundle be used to load Java code?

21. Fill the blank. NSNotification : <> : NSObject

22. Is there a double click event?

23. What is a toll-free bridged class?

24. Can resources be localized?

25. How can you move a view?

26. Why is CGFloat recommenced to be used instead of float?

27. Which of the following creates an autoreleased array?

28. What is NSViewHeightSizable constant used for?

29. Can POSIX thread be used in Cocoa?

30. Is it correct to have sibling views overlapping?

31. What method should be called before you are able to draw in the drawRect: method of a view?

32. Can a notified object find out from where the notification is coming? (Sending Object)

33. In a typical Cocoa application, do you have to manage your runloop yourself?

34. Does Cocoa support 64bits?

35. What is a notification?

36. Is the following code valid? NSSize s = NSMakeSize(10, 10); int values[20]; values[s.height] = 5;

37. Can you detach threads in Cocoa?

38. Can NSDistributedNotificationCenter be used to communicate between multiple machines?

39. Which of the following classes manages the computer’s global notifications?

40. Fill the blank NSMutableArray : <> : NSObject

41. What method should be called before you are able to draw outside the drawRect: method of a view?

42. If you spawn a thread with POSIX thread api, will Cocoa be notified?

43. What is NSRect?

44. Fill the blank. NSCountedSet : <> : NSObject

45. How is a GUI usually created in Cocoa?

46. What is the normal way of handling cocoa events?

47. Where should application resources be usually put?

48. Which of the following platforms supports Cocoa?

49. Can an object be the delegate of multiple objects?

50. How wide is unichar on a 32bit machine?

51. Can you use malloc/free in a Cocoa application?

52. Fill the blank. NSButton : <> : NSObject

53. What is an observer?

54. Can poll() be used to fetch Cocoa events?

55. What class should be used to load resources?

56. Is it mandatory to create an NSAutoreleasePool in a Cocoa application?

57. Is NSString mutable?

58. In which language is Cocoa written?

59. Under Mac OS X 10.5, CGRect, CGSize and CGPoint have the same structure as NSRect, NSSize and NSPoint respectively. Is it true?

60. The ________ object is the application's main controlling object.

61. A ______ object sends a message automatically to a target when an on-screen object is manipulated.

62. Which does not belong in web infrastructure:

63. Which one is not a Navigator in Xcode?

64. ________ are NOT a Cocoa event.

65. What does the Interface Builder in Xcode do?

66. The Mac OS X _______ replaces the Mac OS 9 Application menu.

67. _______ is not a subclass of NSResponder.

68. The ______ is a section of code that reads events and performs appropriate functions for those events.

69. The ________ is a framework that contains all the objects needed to implement a graphical event-driven user interface.

70. The Mac OS X graphical user interface (GUI) is called _________.

71. True or False? NSNumber objects cannot be changed after initialization.

72. NSDocument class is used for ______.

73. A Cocoa ______ is a message and a corresponding object sent to an application in response to some action taken by the user.

74. True or False? Memory management is completely automatic.

75. ______ is NOT a type of Mac OS X on-screen window.

76. In Xcode, what does the Identity Inspector do?

77. _______ class allows you to journal events in your application.

78. _______ is the object persistence framework included with Foundation Kit.

79. ______ is Apple's computing infrastructure that consists of Mach, Unix services, and Mac OS X networking and filesystems.

2.
Is the following code correct?

NSMutableArray *a = [NSMutableArray new];

// do something with a

[a release];

3.
Is the following code correct?

NSMutableArray *a = [[NSMutableArray new] autorelease];

// do something with a

[a release];

4.
Is the following code correct?

NSMutableArray *a = [NSMutableArray array];

// do something with a

[a release];

5.
If you call interpretKeyEvents:, which of the following method is likely to be called?

6.
What will be the output of the following code?

NSRect rect = NSMakeRect(0, 0, 10, 10);
NSRect rect2 = malloc(sizeof(rect2));
if(!rect2) {
NSLog(@"Not enough memory.");
exit(EXIT_FAILURE);
}

*rect2 = rect;

printf("%d\n", rect.size.width);

7.
Is NSRunLoop thread safe?

8.
Can an object marked for autorelease be retained?

9.
Fill the blank
NSView : <> : NSObject

10.
Can you use NSLock on a POSIX mutex?

11.
What kind of memory management mechanisms can Cocoa uses?

12.
Which of the following retrieves the application main bundle?

13.
Is it possible to create events and dispatch them to the application?

14.
What is Cocoa?

15.
Is the following code correct?
- (void)myMethod:(NSString **)s {
*s = [[NSString alloc] init];
}

16.
What is true regarding notifications?

17.
What threading API should be used in Cocoa?

18.
Is the following code valid?
NSRect r;
r.size = NSMakeSize(10,10);
r.origin = NSMakePoint(-5, -5);

19.
Where is the (0,0) coordinate located on the screen?

20.
Can NSBundle be used to load Java code?

21.
Fill the blank.
NSNotification : <> : NSObject

22.
Is there a double click event?

23.
What is a toll-free bridged class?

24.
Can resources be localized?

25.
How can you move a view?

26.
Why is CGFloat recommenced to be used instead of float?

27.
Which of the following creates an autoreleased array?

28.
What is NSViewHeightSizable constant used for?

29.
Can POSIX thread be used in Cocoa?

30.
Is it correct to have sibling views overlapping?

31.
What method should be called before you are able to draw in the drawRect: method of a view?

32.
Can a notified object find out from where the notification is coming? (Sending Object)

33.
In a typical Cocoa application, do you have to manage your runloop yourself?

34.
Does Cocoa support 64bits?

35.
What is a notification?

36.
Is the following code valid?
NSSize s = NSMakeSize(10, 10);
int values[20];
values[s.height] = 5;

37.
Can you detach threads in Cocoa?

38.
Can NSDistributedNotificationCenter be used to communicate between multiple machines?

39.
Which of the following classes manages the computer’s global notifications?

40.
Fill the blank
NSMutableArray : <> : NSObject

41.
What method should be called before you are able to draw outside the drawRect: method of a view?

42.
If you spawn a thread with POSIX thread api, will Cocoa be notified?

43.
What is NSRect?

44.
Fill the blank.
NSCountedSet : <> : NSObject

45.
How is a GUI usually created in Cocoa?

46.
What is the normal way of handling cocoa events?

47.
Where should application resources be usually put?

48.
Which of the following platforms supports Cocoa?

49.
Can an object be the delegate of multiple objects?

50.
How wide is unichar on a 32bit machine?

51.
Can you use malloc/free in a Cocoa application?

52.
Fill the blank.
NSButton : <> : NSObject

53.
What is an observer?

54.
Can poll() be used to fetch Cocoa events?

55.
What class should be used to load resources?

56.
Is it mandatory to create an NSAutoreleasePool in a Cocoa application?

57.
Is NSString mutable?

58.
In which language is Cocoa written?

59.
Under Mac OS X 10.5, CGRect, CGSize and CGPoint have the same structure as NSRect, NSSize and
NSPoint respectively. Is it true?