The first is looking for the object-- the number of hours worked by the person . The other two questions are asking for the subject-- who became and who has . Is that what you mean?
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AnonymousWhich are subject and which object questions and why?If the answer goes in the subject positiion, it's a subject question. If the answer goes in the object position, it's an object question. I assume you already know how to identify the subject and the object in a statement.