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oil raise up the wick in a lamp. The principle involves

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oil raise up the wick in a lamp. The principle involves Answer: capillary action phenomenon

Question context

This question is part of 📚 General Knowledge within the broader 🌐 Current Affairs & GK subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.