Difference between cocoa, cocoa touch and objective c?

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What is an NSOperationQueue and how/would you use it in iOS operating system?

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What json framework supported by ios?

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Tell me what is iphone os?

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 Is a delegate retained?

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Explain about iphone application development?

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. Apart from incorporating views and controls, what else an app can incorporate?

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What is category in ios?

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How do I become an ios developer?

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Is it possible to write a program without using nib file

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Why uicontrol is provided if we can create custom uiview?

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What is iphone architecture?

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