in the admin/admin-moderate.php
list($queuedquestions, $queuedanswers, $queuedcomments) = qa_db_select_with_pending(
qa_db_qs_selectspec($userid, 'created', 0, null, null, 'Q_QUEUED', true),
qa_db_recent_a_qs_selectspec($userid, 0, null, null, 'A_QUEUED', true),
qa_db_recent_c_qs_selectspec($userid, 0, null, null, 'C_QUEUED', true)
);
where, in the db/selects.php, the above three functions defined.
In each, a upper limit of no.of records set via
$count = isset($count) ? min($count, QA_DB_RETRIEVE_QS_AS) : QA_DB_RETRIEVE_QS_AS;
QA_DB_RETRIEVE_QS_AS is set to 50 in db/maxima.php
So, 50 questions, 50 answers and 50 comments, total 150 posts displayed on the moderation page.