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Too simple questions.

Any site that has an ad with audio turned on immediately gets a thumbs down

sorry, i didn't even know that ad was there ;) firefox rulez ))

Q2 Answer has confused grammar, so maybe part wrong.

Q3 Answer is only half right.
synchronized blocks are not for saving time they are for locking a specified object (which maybe a class), so that one thread owns that object while executing inside the block, they can be less efficient and less safe that synchronized methods. You can even have nested synchronized blocks for different objects, but that can be an invitation for Thread deadlocks and maybe a sign of poor coding practice.

Q19 Answer did not mention the new advice from Sun advice that active Swing and AWT objects like JFrame, JWindow, Frame, Window etc. must only be created and access on the GUI Event Thread, even if not visible or enabled.