railway RRB Group D Mock Test Series 2024-25 General Knowledge Science Technology and Inventions

ଟେଲିଫୋନ୍ କାହା ଦ୍ୱାରା ଉଦ୍ଭାବନ କରାଯାଇଥିଲା:

1
ବାଇର୍ଡ
2
ଆଲେକ୍ସଜାଣ୍ଡାର୍ ଗ୍ରାହାମ୍ ବେଲ୍
3
ନ୍ୟୁଟନ୍
4
ଷ୍ଟିଭେନ୍ସନ୍
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