IOS Set 2

1.

In iOS, which of the following is the correct implementation of the autorelease function?

(id)autorelease { // Add the object to the autorelease pool [NSAutoreleasePool addObject:self]; return self } (id)autorelease { // Add the object to the autorelease pool [NSAutoreleasePool addObject:self]; return self; } (void)autorelease { // Add the object to the autorelease pool [NSAutoreleasePool addObject:self]; return self } None of these

2.

In iOS, which of the following statements is true for an app in the active state?

The app is running in the foreground but is currently not receiving events. The app has not been launched or was running but was terminated by the system. The app is running in the foreground and is receiving events The app is running in the background and is receiving events

3.

In iOS, which of the following statements is true for an app in the background state?

The app is running in the foreground but is currently not receiving events. The app has not been launched or was running but was terminated by the system. The app is running in the foreground and is receiving events An app is being launched directly into the background enters this state instead of the inactive state.

4.

Which of the following statements is true about the retain function in iOS?

It creates a reference from one object to another and increases the retain count of the source object. It creates a reference from one object to another without increasing the sourcea™s retain count. None of these

5.

Which of the following statements is true about the assign function in iOS?

It creates a reference from one object to another and increases the retain count of the source object. It creates a reference from one object to another without increasing the sourcea™s retain count. All of these None of these

6.

Which of the following statements is true about categories in iOS:

A category is a feature of the Objective-C language that enables users to add methods (interface and implementation) to a class without having to make a subclass.
The methods in the category become a part of the class type and are inherited by all the subclasses.
There is no runtime difference within the scope of the program between the original methods of the class and the methods added by the category.

1 2 3 1, 2

7.

Which of the following statements is true about posing in iOS?

A class may only pose as one of its direct or indirect superclasses. The posing class must not define any new instance variables.which are absent from the target class (though it may define or override methods). No messages must have been sent to the target class prior to the posing. All of these

8.

Which of the following JSON frameworks is supported by iOS?

ABJson framework SBJson framework XJson framework None of these

9.

Which of the following frameworks is used to develop the user interface of an application in iOS?

UI framework iOSUI framework UIKit framework None of these

10.

In iOS, which of the following facilities is not provided by the UIKit framework?

Event handling Drawing model Keypad interface All of these

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IOS Set 2

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