Which of the following is one use for alpha channels?

Where can you find the option to reverse the layer order?

You open a document and some of the filters are disabled in the Filter menu. Which could be a reason for this?

You can copy and paste a selection into a layer's mask but not a vector mask.

When resizing an image, which resampling method does not employ any anti-aliasing smoothing?

Version of Adobe Bridge that can be used from a palette within Photoshop CS5 and later?

Which file format supports 16-bit color, 8-bit color, indexed color, grayscale, and alpha channels, but not CMYK?

Which control in camera raw lets you quickly recover detail in the shadows without unduly affecting highlights or causing posterization ?

Which format cannot be imported as a 3D object?

When using the Brush tool, Shift + [...

If you apply the difference blend mode to a new layer duplicate, what is the result?