Robyn
Robyn may I suggest something here please. Multiple choice answers to questions here in the UK, began with the GED (Aged 16 yrs first formal exam) Physics paper around 1969 to 1971. It was pioneered by the Nuffield Science foundation and really made good ground in physics education.
It was found that a maximum of four variables worked well to assess the ability of the student. When more options were added the results became worthless. So in this light I would be most grateful if you could limit the options to four.
It is best not to ask for two variables in one question. So if you have one fixed, then give the possible answers in the options you will get more replies. So really asking a question that depends on, or is premised on, a question is counter productive and makes the concept more complicated than it really is.
Hope this helps.
Regards
P.S The big intake fans on the jet engines have some really wonderful BLADE profiles..far more interesting than wing profiles.
Last edited by DERG; 19th February 2011 at 14:44.