state gov BPSC LDC Mock Test 2021 General Knowledge Science Technology and Inventions

'निऑन दिव्या' चा शोध _____ यांनी लावला.

1
जॉर्जेस क्लॉड
2
सॅम्युअल कोल्ट
3
मार्टिन कूपर
4
विल्यम कुलेन
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