state gov Assam (অসম) ADRE Grade III Mock Test Series 2025 General Knowledge Science Technology and Inventions

टेलीफोन के अविश्कारक थे

1
आइन्स्टीन 
2
रोबर्ट हुक
3
जॉन नेपियर
4
अलेंग्जेंडर ग्राहम बेल
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