Well, the problem is that the OP wasn't very clear about what is a duplicate record. He mentioned an ID, but it isn't in the table description, so I assumed that a primary key existed, apart the columns that were mentioned.

Anyway, if the problem is (more trivially) to find out if several records have the same "questions" column, then it's even simpler:

SELECT 
    questions,
    COUNT(*) AS howmany
FROM 
    yourtable
GROUP BY
    questions
HAVING
    howmany > 1
[download]

To remove such duplicates, on the same vein:

ALTER IGNORE TABLE yourtable ADD UNIQUE KEY (questions)
[download]