Actually you're probably better off using nested associative arrays if you want to store q's and answers:

Code:
$muckabout=array();

$muckabout[]=array("question"=>"How many Chinese in China?", "answer"=>"too many");

$muckabout[]=array("question"=>"How many engineers does it take to screw in a light bulb?", "answer"=>"way too many");
And no the above the are not good questions for captcha