What is the difference strong and weak reference?
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Explain the difference between cocoa and cocoa touch?
Are document objects required for an application? What does they offer?
What is iphone screen size?
What is the use of double question marks (“??”) ?
Is core data is thread safe?
Explain what is storyboard?
Explain the difference between NSOperationQueue concurrent and non-concurrent in iOS operating system?
What is fast enumeration in iOS operating system?
When an app is said to be in active state?
What is ipa?
. Why an app on iOS device behaves differently when running in foreground than in background?
. How do you change the content of your app in order to change the views displayed in the corresponding window?