What is the use of Alpha value that is available in attributes of every Interface Builder object?

How can you create an OpenGL ES texture with a .png image?

Can non-main threads poll for events?

Which is a feature of CAPropertyAnimation class in Core Animation?

What is the default value for the anchorPoint property in Layer Geometry?

Can you place calls using the iPhone SDK?

What method definition do if the value of the accessed counter is 0? - (void)discardContentIfPossible

Which Core Audio Service framework is used to record, play back, pause, loop, and synchronize audio in iPhone OS 4.0?

What will the hitTest: object of the CALayer class return if the point lies outside the receiver's bounds rectangle?

Apple's implementation of HTTP Live Streaming supports DRM (Digital rights management).

You want to animate a layer's opacity to 0 while moving it further away in the layer. Which of the following code snippets will you use?