engineering recuitment UPMRC JE 2024 Mock Test Electrician and Wireman Electronic Devices and Circuits Conductors and Insulators

किस पदार्थ का ताप गुणांक धनात्मक होता है?

1
पीवीसी ​(P.V.C.)
2
तांबा 
3
रबर
4
विद्युत अपघट्य
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