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

__________ ने टेलीफोन का आविष्कार किया था। 

1
बैरड
2
अलेक्जेंडर ग्राहम बेल
3
न्यूटन 
4
स्टीवेनसन
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