True-False items also have several limitations. They:
incorporate an extremely high guessing factor. For simple true-false items, each student has a 50/50 chance of correctly answering the item without any knowledge of the item's content.
can often lead an instructor to write ambiguous statements due to the difficulty of writing statements which are unequivocally true or false.
do not discriminate between students of varying ability as well as other item types.
can often include more irrelevant clues than do other item types.
can often lead an instructor to favor testing of trivial knowledge.