state gov UP Police Head Operator (Radio Cadre) Mock Test General Knowledge Science Technology and Inventions

क्ष-किरणांचा शोध कोणी लावला?

1
थॉमस सेव्हरी
2
थॉमस न्यूकॉमन
3
आयझॅक न्युटन
4
विल्हेल्म रोएंटजेन
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