Explain the difference between nil and nil?
What is the purpose of UIWindow object in iOS operating system?
what is the difference between Xcode, Cocoa and Objective C?
What is reference count in ios?
Explain @synchronized ,@dynamic
How nsoperationque works?
What is code signing in iOS operating system?
What is ios architecture?
When an app is said to be in active state?
What is an NSOperationQueue and how/would you use it in iOS operating system?
What are the app states in ios?
Explain steps for using coredata?
What are some common execution states in ios?
How to set your application id after becoming a member of iphone developer program?
Mention what is the use of po command in xcode?