state gov WBPSC Clerkship Mock Test 2023 - 24 General Science Biology Invention and Discoveries

विल्हेम कॉनराड राँटजेन यांनी कशाचा शोध लावला? 

1
विद्युत प्रभाराचे संवर्धन 
2
इलेक्ट्रिक बल्ब
3
क्ष-किरणे 
4
ऊष्मागतिकी
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