विद्युत बल्ब फिलामेंट का ब – McqOptions

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1.	विद्युत बल्ब फिलामेंट का बना होता है
A.	तांबा
B.	अल्युमीनियम
C.	प्रमुख
D.	टंगस्टन
Answer» B. अल्युमीनियम

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