railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Current Electricity

तापदीप्त दिव्यातील तंतू कशापासून तयार झालेला असतो?

1
टंगस्टन तार
2
निक्रोम तार
3
तांबे तार
4
वितळतार
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