railway RRB Group D Mock Test Series 2024-25 General Knowledge Science Technology and Inventions

टेलिफोनचा शोध काेणी लावला?

1
बेर्ड
2
अलेक्झांडर ग्रॅहम बेल
3
न्यूटन
4
स्टीव्हनसन
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