Sorry I've been so late in contributing to this discussion.
There are two other sources of multiple choice questions that I have found:
1) Accompanying the Siegel text "Statistics and Data Analysis" published by Wiley There is a TEST BANK containing multiple choice questions. I think that they are more challenging than Moore's, but people who know Statictics more completely can probably evaluate them better than I.
2) At an NCTM conference I picked up a small booklet of multiple choice questions called "Preliminary Actuarial Exams" . I believe this is only one of a series of such booklets since when I began teaching BC Calc, they were recommended as a good resource for MC questions (Obviously this was a while ago before so many other sources for MC questions existed)
I haven't had the time to research this further but I'm sure that by contacting the publishers of this booklet either : SOCIETY OF ACTUARIES 475 N. Martingale Rd. Schaumberg, Ill 60173
or: CASUALTY ACTUARIAL SOCIETY 1100 N. Glebe Road Arlington VA 22201
more complete information can be obtained. Perhaps they have websites.