SSC SSC CPO Mock Test Series 2025 (Tier I & II) (DP SI & CAPF) General Knowledge Science Technology and Inventions

मायक्रोवेव्हचा शोध खालीलपैकी कोणी लावला?

1
पर्सी स्पेन्सर
2
हेन्री बॅकेरल
3
दिमित्री मेंडेलीव्ह
4
विल्सन ग्रेटबॅच
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