UpWork (oDesk) & Elance Cocoa programming for Mac OS X 10.5 Test Question & Answers

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Ques : What is true regarding notifications?
Ans  : They can be dispatched to only one object + The object posting the notification does not even have to know whether the observer exists

Ques : What class should be used to load resources?
Ans  : NSBundle

Ques : What is a notification?
Ans  : A special message type used within the kernel

Ques :  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);
Ans  :  None of the above

Ques : Is the following code correct?

NSMutableArray *a = [NSMutableArray array];

// do something with a

[a release];
Ans  :  No

Ques : Is the following code valid?

NSSize s = NSMakeSize(10, 10);

int values[20];

values[s.height] = 5;
Ans  : Compile error

Ques : Which of the following platforms supports Cocoa?
Ans  : Mac OSX

Ques : Is there a double click event?
Ans  : Yes

Ques : Is the following code correct?

NSRect a = NSMakeRect(0, 1, 2, 3) + NSMakeRect(0, 1, 2, 3);
Ans  : No

Ques : Is the following code valid?

NSRect r;
 
r.size = NSMakeSize(10, 10);
r.origin = NSMakePoint(-5, -5);
Ans  : Yes

Ques : Is the following code correct?

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

// do something with a

[a release];
Ans  : No

Ques : Which of the following retrieves the application main bundle?
Ans  : [NSBundle mainBundle]

Ques : Can you use NSLock on a POSIX mutex?
Ans  : Yes

Ques :  If you spawn a thread with POSIX thread api, will Cocoa be notified?
Ans  :  No

Ques : What method should be called before you are able to draw in the drawRect: method of a view?
Ans  :  None

Ques : Which of the following creates an autoreleased array?
Ans  : [NSMutableArray new];

Ques :  Can an object marked for autorelease be retained?
Ans  :  Yes

Ques : Fill the blank.
NSView : <> : NSObject
Ans  : NSResponder

Ques : If you call interpretKeyEvents:, which of the following method is likely to be called?
Ans  : insertText:

Ques : Where is the (0,0) coordinate located on the screen?
Ans  : bottom-left

Ques : What method should be called before you are able to draw outside the drawRect: method of a view?
Ans  : lockFocus

Ques : Can NSBundle be used to load Java code?
Ans  : No

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

Ques : What is an observer?
Ans  : An object registered with the notification center

Ques : Does Cocoa support 64bits?
Ans  : Yes

Ques : Fill the blank.

NSMutableArray : <> : NSObject
Ans  : NSArray

Ques : What is NSRect?
Ans  : A structure

Ques : Fill the blank.
NSCountedSet : <>  : NSObject
Ans  : NSMutableSet : NSSet

Ques : Can NSDistributedNotificationCenter be used to communicate between multiple machines?
Ans  : No

Ques : Is the following code correct?

NSMutableArray *a = [NSMutableArray new];

// do something with a

[a release];
Ans  : Yes

Ques : What threading API should be used in Cocoa?
Ans  : NSThread

Ques : How can you move a view?
Ans  : By changing the frame with setFrame:

Ques : Fill the blank.
NSButton : <> : NSObject
Ans  :  NSControl : NSView : NSResponder

Ques :  How is a GUI usually created in Cocoa?
Ans  : With interface builder

Ques : Is it possible to create events and dispatch them to the application?
Ans  : No

Ques : Can POSIX thread be used in Cocoa?
Ans  : Yes

Ques : Is it correct to have sibling views overlapping?
Ans  : No

Ques : In a typical Cocoa application, do you have to manage your runloop yourself?
Ans  : No

Ques :  Is NSString mutable?
Ans  : No

Ques : Can you use malloc/free in a Cocoa application?
Ans  : Yes, but only in a separate C library

Ques : What is NSViewHeightSizable constant used for?
Ans  : Autoresizing

Ques : Can poll() be used to fetch Cocoa events?
Ans  : Yes

Ques : What is a toll-free bridged class?
Ans  :  A class that can be interchanged with another class by casting

Ques : What is Cocoa?
Ans  : A framework

Ques : Is NSRunLoop thread safe?
Ans  :No

Ques : In which language is Cocoa written?
Ans  : Objective-C

Ques : Where should application resources be usually put?
Ans  : Within the application's bundle

Ques : Can an object be the delegate of multiple objects?
Ans  : No

Ques : Can an object be the delegate of multiple objects?
Ans  :  No

Ques : Is it mandatory to create an NSAutoreleasePool in a Cocoa application?
Ans  : No

Ques : What is the normal way of handling Cocoa events?
Ans  :  By implementing NSResponder methods in subclasses

Ques : Which of the following classes manages the computer's global notifications?
Ans  : NSDistributedNotificationCenter

Ques :  Can a notified object find out from where the notification is coming? (Sending object)
Ans  : Yes

Ques : How wide is unichar on a 32bit machine?
Ans  : 8bit

Ques : Fill the blank.

NSNotification : <> : NSObject
Ans  : Nothing is required to fill the blank

Ques : What kind of memory management mechanisms can Cocoa uses?
Ans  : Reference counting

Ques :  Can you detach threads in Cocoa?
Ans  : Yes

Ques : Which of the following is a valid Uniform Type Identifier?
Ans  : public.jpeg

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