railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Wave

एकापाठोपाठ किंवा अनेक _______मुळे प्रतिध्वनी एकापेक्षा जास्त वेळा ऐकू येतात.

1
विवर्तन
2
अपवर्तन
3
दुर्मिळता
4
प्रतिबिंब
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