You should fill the blank with whenever, making the sentence: "I visit the Faisal Mosque whenever I go to Islamabad," which means you visit it every time you are in the city. Other possibilities like "once" or "wherever" don't fit the intended meaning of a recurring action tied to your trips to Islamabad.
I visit Faisal Mosque _______ I go to Islamabad.
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Question context
This question is part of 📚 General Knowledge within the broader 🌐 Current Affairs & GK subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.