विधुत बल्ब (Bulb) का फिलामेंट किसका बना होता है ?

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Question: विधुत बल्ब (Bulb) का फिलामेंट किसका बना होता है ?
1. क्रोमियम
2. टंगस्टन
3. ताँबा
4. जस्ता
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Written By Mahesh Mahala

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