SSC SSC JE Civil 2025 Mock Test Series (Paper 1 & Paper 2) General Knowledge Science Technology and Inventions

ଅପ୍ଟିକାଲ ଫାଇବରର ଆବିଷ୍କାରକ କିଏ?

1
ସାମୁଏଲ କୋହେନ
2
ନରିନ୍ଦର କାପାଣି
3
ପି. ଏଲ୍. ସ୍ପେନ୍ସର
4
ଟି. ଏଚ. ମାଇମା
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