engineering recuitment NCRTC Junior Engineer Mock Test Series 2025 General Knowledge Science Technology and Inventions

किरणोत्सारिता हा शब्द कोणी वापरला?

1
मॅरी क्युरी
2
नील्स बोहर
3
रिचर्ड फेनमन
4
मार्सेलो माल्पिघ
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