Read number of entries, duration of stay, and validity of the visa.
If you have single entry and you've been there once, then you have to get a new one; If it's multiple entry, then see if you have already stayed the number of days allowed; If you still have days remaining, then see if the validity has not expired, if not, then you can visit there again.
No. Cyprus is not part of the Schengen Area. A Schengen visa is not valid in Cyprus.
Yes, Poland is part of the Schengen Area and Schengen visas are valid.
No. Morocco is not part of the Schengen Area.
Yes.There are no border controls between France and Monaco, so a Schengen visa is valid.
Yes, Switzerland is part of the Schengen Area. Schengen visas are valid.
No. Turkey requires a separate visa since is not part of the Schengen Area (assuming you are from a country that requires a VISA to enter Turkey). Schengen visas are not valid in Turkey.
Ukraine is not part of the Schengen Area. A Schengen visa is not valid in the Ukraine.
No, a Schengen visa is not valid for Istanbul. Istanbul is in Turkey, and Turkey is not part of the Schengen Area.
Romania was not included in the Schengen group.
Yes, You need a separate visa for Turkey. Turkey is not part of the Schengen Area. Schengen visas are not valid.
No, Ukraine is not part of the Schengen Area and Schengen visas are not valid.
Yes,Both Switzerland and Germany are members of the Schengen Area. A tourist visa for one Schengen country is valid for all Schengen countries.