बिजली के बल्ब का फिलामेंट .. – McqOptions

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1.	बिजली के बल्ब का फिलामेंट ..........का बना होता है -
A.	ताँबा
B.	एल्युमिनियम
C.	टंग्सटन
D.	मिश्रधातु
Answer» D. मिश्रधातु

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