When there's free days, only admission to the Museum is free, but you still have to pay to get in the Exibits.
Yes. On free days, only the entrance will be free, however you'll still have to pay for certain exhibits. In fact, the museum's website states that even during free days, "Giant Dome Theater films, Coal Mine and optional U-505 onboard tours, and certain temporary exhibits are not included in Museum Entry, and require separate admission."
As everyone says, on free days admissiion to the museum is free, but exhibits are extra. However, the museum without exhibits is still a wonderful experience with lots to offer.
Yes coal mine, submarine tour, pixel etc need to be paid
Yes
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