railway RRB Technician Grade 3 Mock Test 2024 General Science Biology Scientific Developments

ଭାରତରେ 'ଡିଏନ୍ଏ ଫିଙ୍ଗର୍ ପ୍ରିଣ୍ଟିଂର ପିତା' ଭାବରେ କିଏ ଜଣାଶୁଣା?

1
ଡଃ ରାଜାଜୀ ତ୍ରିବେଦୀ 
2
ଏମ୍ଏସ୍ ସ୍ଵାମୀନାଥନ୍ 
3
ଡଃ ଲାଲଜୀ ସିଂ 
4
ସିଏନଆର ରାଓ 
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