engineering recuitment DRDO CEPTAM STA B Tier I (Sr. Technical Assistant) Mock Test 2022 General Science Biology Scientific Developments

ଧ୍ୱନି ତରଂଗ ର ଉତ୍ପାଦନ ଏବଂ ସଞ୍ଚରଣ ର ଅଧ୍ୟୟନ କୁ କଣ କୁହାଯାଏ ? 

1
ଅପଟିକ୍ସ
2
ଫୋଟୋନିକ୍ସ 
3
ଆଷ୍ଟ୍ରୋଫିଜିକ୍ସ 
4
ଆକୋଷ୍ଟିକ 
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