Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Engineering Materials Science Structure and Properties of Engineering Materials Classification of Materials
In transmission electron microscopy, the electron gun filament is made of ?
1
silver wire
2
Tungsten wire
3
gold wire
4
More than one of the above
5
None of the above