railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test General Science Chemistry Periodic Table

LED अर्धवाहक तंत्रज्ञानामध्ये खालीलपैकी कोणता धातू वापरला जातो?

1
लोह
2
तांबे
3
जस्त
4
गॅलियम
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