Which two HTML5 code fragments automatically play a video upon page load? Choose two.

Match the JavaScript objects to the corresponding characteristics or methods. (To answer, drag the appropriate JavaScript object from the column on the left to its characteristic or method on the right. Each JavaScript object may be used once, more than once, or not at all. Each correct match is worth one point.)

Which code fragment sets up a timer that calls a function named "adjust" every second?

The variable named "ctx" is the context of an HTML5 canvas object. What does the following code fragment draw? ctx.arc(x, y, r, 0, Math.PI, true);

You need to ensure the scope of a variable named j is limited to the block of a single function named foo().
Which JavaScript code fragment will accomplish this?