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Radio signals are reflected by which layer of the atmosphere?

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Radio signals are reflected by which layer of the atmosphere? Answer: Ionosphere

Question context

This question is part of 📡 Electronics and Communication Engineering (ECE) within the broader 🛠️ Engineering Essentials subject and appears in the MOD - MINISTRY OF DEFENCE preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.