Objective C MCQs (Chapterwise Multiple Choice Questions)

what does this code produce? [NSString] *myString = @"Hello World";

gets SIGABRT while executing the application

none of the above

An Error during compile

it put the value Hello World into a string named myString

makes the pointer to myString equal to the pointer of the new created object with @"hello world"

Answer & Explanation

Correct Answer: An Error during compile

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how can we return multiple values from function?

tuple

not possible

void*

Answer & Explanation

Correct Answer: tuple

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What does ARC stand for?

Automatic Reference Counting

Automatic Retain Checking

Async Retain Cycles

Automatic Release Code

Answer & Explanation

Correct Answer: Automatic Reference Counting

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What framework is KVO (key value observing) a part of?

UIKit

CoreData

Foundation

Answer & Explanation

Correct Answer: Foundation

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To display some web page, Apple provides a predefined class called:

UIScrollView

UIWebView

UIButton

UIWebSiteView

Answer & Explanation

Correct Answer: UIWebView

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Which of the following is true?

“assign” property attribute stores a direct pointer without any “retain” / “release” calls

“copy” property attribute creates and assigns a copy of an object it is set to, but you will need to call a “release” on the original variable

“retain” property attribute stores a copy of an object with claiming ownership to both original object and it’s copy

None of the above

Answer & Explanation

Correct Answer: “assign” property attribute stores a direct pointer without any “retain” / “release” calls

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

Which of the following is a valid property name of the NSException class?

“code”

“domain”

“userInfo”

“info”

Answer & Explanation

Correct Answer: “userInfo”

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True or False? You should use NSHost when connecting to a specific host.

True

False (You should use CFHost)

Answer & Explanation

Correct Answer: False (You should use CFHost)

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What are categories used for?

To extend other classes

To manage access control

To coordinate objects

To group classes

Answer & Explanation

Correct Answer: To extend other classes

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Which of the following is the fastest?

Explicit locking

Mutex implicit locking

@ Synchronized

Condition locking

Answer & Explanation

Correct Answer: Mutex implicit locking

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Objective C Quick Quiz

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