Teaching UP TGT Mock Test Series 2025 General Science Biology Invention and Discoveries

ନିମ୍ନଲିଖିତ ମଧ୍ୟରୁ କିଏ 'ରେଡିଓଆକ୍ଟିଭିଟି' ଆବିଷ୍କାର କରିଥିଲେ?

1
ହେନେରୀ ବେକେରେଲ୍
2
ରଦରଫୋର୍ଡ 
3
ଜେମ୍ସ ଚାଦୱିକ୍  
4
ଆଲବର୍ଟ ଆଇନଷ୍ଟାଇନ୍ 
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