What is gcd in ios?
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what is singleton class? Why the whole application creates a single instance?
Explain the difference between coredata & sqlite?
Is uikit thread safe?
What are the App states in iOS operating system? Explain them
What is nsoperation and nsoperationqueue?
What are “strong” and “weak” references? Why are they important and how can they be used to help control memory management and avoid memory leaks?
Difference between cocoa, cocoa touch and objective c?
Explain how do I get a call when my ipad rings?
What is factory methods ? What is the advantage of using it ?
What is push notification?
Explain @property ,@synthesize
What happens if iapplication object does not handle an event?