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Railways PYQCBT 2 2017

RRB NTPC · Question 101

Which of the following layers of the atmosphere makes Radio Communication possible?

  1. Troposphere

  2. Thermosphere

  3. Ionosphere

  4. Stratosphere

Show answer & explanation

Answer: (C) Ionosphere

Explanation

The ionosphere (about 60–600 km) contains charged particles that reflect radio waves back to Earth, making long-distance radio communication possible.