बेंजामिन फ्रैंकलिन ने क्य� – McqOptions

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1.	बेंजामिन फ्रैंकलिन ने क्या आविष्कार किया था?
A.	बिफोकल चश्मा
B.	रेडियो
C.	बैरोमीटर
D.	आर्द्रतामापी
Answer» B. रेडियो

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